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A331722
Number of nonequivalent 2-column nonnegative integer matrices with column sums n and any number of nonzero rows up to permutation of rows and columns.
1
1, 2, 7, 21, 66, 192, 565, 1579, 4348, 11582, 30205, 76736, 191120, 465920, 1115572, 2623885, 6074353, 13849021, 31137381, 69082779, 151390617, 327897173, 702426987, 1489108503, 3125821257, 6500086120, 13396645887, 27376083598, 55490121271, 111604327066, 222798559100
OFFSET
0,2
LINKS
Zarif Ahsan, Xiran Liu, and Noah Rosenberg, Dissimilarity between a pair of draws from discrete probability vectors on finite sets of objects, Stanford Univ., 2023. See also arXiv:2410.00221, [math.CO], 2024, p. 5.
CROSSREFS
Column k=2 of A331485.
Sequence in context: A027990 A037520 A218836 * A052911 A126133 A344500
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Jan 31 2020
STATUS
approved