[seqfan] n-multisets of integers in (-n..n} adding to n

[David Scambler]

Seqfans,

Count all n-multisets of integers in {-n, ..., n} such that the members sum to n.

a(n) = 1, 2, 7, 27, 121, 587, 2983, 15744, 85375, 473259, 2670383, 15293119, 88686530, 519864702,...

Exclude zero as a member

a(n) = 1, 1, 5, 17, 78, 375, 1919, 10144, 55189, 306632, 1734019, 9948977, 57790152, 339241199,...

I shall submit with mma program if of interest.

dave