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, 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

Author

Andrew Howroyd, Jan 31 2020

Keywords

• nonn

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.