A011812 M-sequences from multicomplexes on 4 variables with all monomials of degree 4 but none of degree larger than n.

0, 0, 0, 0, 1, 57, 2185, 72881, 2322629, 73949186, 2410067138, 81563004129, 2892108485341, 108078014350565, 4273605661408932, 179311027612775138, 7999342346440002428, 379986003510210048053, 19238835001520254448553

Offset

0,6

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=4..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: A229407 A270502 A285238 * A226848 A022231 A239823

Adjacent sequences: A011809 A011810 A011811 * A011813 A011814 A011815

Keyword

nonn

Author

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

Extensions

Offset corrected by Sean A. Irvine, Jun 28 2018

Status

approved