A011815 - OEIS

A011815

M-sequences from multicomplexes on 4 variables with all monomials of degree 7 but none of degree larger than n.

0, 0, 0, 0, 0, 0, 0, 1, 166, 17084, 1429000, 107722408, 7709260963, 539697521271, 37652839010763, 2649928897359089, 189683841710882135, 13888624543485989550, 1044391475357613415884

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OFFSET

0,9

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=7..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: A193984 A144380 A204963 * A188413 A144929 A281934

Adjacent sequences: A011812 A011813 A011814 * A011816 A011817 A011818

KEYWORD

nonn

AUTHOR

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

EXTENSIONS

Offset corrected by Sean A. Irvine, Jun 28 2018

STATUS

approved