A011813 M-sequences from multicomplexes on 4 variables with all monomials of degree 5 but none of degree larger than n.

0, 0, 0, 0, 0, 1, 85, 4699, 219836, 9595906, 409867615, 17589965248, 770635739545, 34813976611381, 1632431803786770, 79803825438459069, 4080007508711841376, 218627996809373217066, 12298853131687073056568

Offset

0,7

References

S. Linusson, The number of M-sequences and f-vectors, Combinatorica, 19 (1999), 255-266.

Links

Table of n, a(n) for n=0..18.

Formula

a(n) = Sum_{k=5..n} L(4, n, k) where L(p, n, k) = Sum_{i=k..n} L(p-1, n, i) * L(p, i-1, k-1) with boundary conditions L(p, n, n) = L(p, n, -1) = 1 (p >= 0, n >= -1), L(0, n, k) = 0 (0 <= k < n) [from Linusson]. - Sean A. Irvine, Jun 28 2018

Crossrefs

Sequence in context: A158796 A201796 A093285 * A006106 A015338 A181015

Adjacent sequences: A011810 A011811 A011812 * A011814 A011815 A011816

Keyword

nonn

Author

Svante Linusson (linusson(AT)math.kth.se)

Extensions

Offset corrected by Sean A. Irvine, Jun 28 2018

Status

approved