Journal of Integer Sequences, Vol. 29 (2026), Article 26.2.8

Enumeration of Certain k-Block Partitions of Barry


Bulat Khaidarov
Grintek Ltd.
Khuroson 1, Ulugbek
100214 Tashkent
Uzbekistan

Abstract:

The sequence A080416, proposed by Barry, is a Stirling-like number triangle defined by a paired decomposition of C(n+3,3). The recurrence formula for this sequence can be derived from an article by Corcino et al. However, explicit formulas have not been discovered. In this paper, we derive two formulas for calculating the members of this sequence. One of them involves matrix multiplication, while the other one does not require it. We also generalize the approach for sequences defined by counting North-East lattice paths with weights.


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(Concerned with sequences A008277 A008278 A013609 A013610 A013611 A013612 A013613 A013614 A013615 A013616 A013617 A013618 A013619 A013620 A013621 A013622 A013623 A013624 A013625 A013626 A013627 A013628 A022166 A027465 A027466 A027467 A028246 A038207 A038208 A038210 A038212 A038214 A038215 A038216 A038217 A038218 A038220 A038221 A038222 A038224 A038226 A038227 A038228 A038229 A038230 A038231 A038232 A038233 A038234 A038236 A038238 A038239 A038240 A038241 A038242 A038243 A038244 A038245 A038246 A038247 A038248 A038250 A038251 A038252 A038253 A038254 A038255 A038256 A038257 A038258 A038259 A038260 A038262 A038263 A038264 A038265 A038266 A038267 A038268 A038269 A038270 A038271 A038272 A038273 A038274 A038275 A038276 A038277 A038278 A038279 A038280 A038281 A038282 A038283 A038284 A038285 A038286 A038287 A038288 A038289 A038290 A038291 A038292 A038293 A038294 A038295 A038296 A038297 A038298 A038299 A038300 A038301 A038302 A038303 A038304 A038305 A038306 A038307 A038308 A038309 A038310 A038311 A038312 A038313 A038314 A038315 A038316 A038317 A038318 A038319 A038320 A038321 A038322 A038323 A038324 A038325 A038326 A038327 A038328 A038329 A038330 A038331 A038332 A038333 A038334 A038335 A038336 A038337 A038338 A080416 A090582 A108084 A113025 A123187 A126351 A130850 A143395 A144084 A147716 A303901 A317498.)


Received January 6 2026; revised versions received January 7 2026; April 13 2026. Published in Journal of Integer Sequences, May 3 2026.


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