OFFSET
0,2
COMMENTS
Also number of multiset partitions of [1,1,1,2,2,2,...,n,n,n] into nonempty multisets. - Marko Riedel, Nov 29 2022
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..100
EXAMPLE
a(1) = 3 because up to permutations of rows there are 3 column vectors with sum 3: [1, 1, 1], [2, 1, 0] and [3, 0, 0].
CROSSREFS
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Dec 11 2018
STATUS
approved