A011810 - OEIS

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A011810

M-sequences from multicomplexes on 4 variables with all monomials of degree 2 but none of degree larger than n.

0, 0, 1, 21, 330, 4931, 76064, 1257345, 22707559, 452800399, 10023029299, 246756095614, 6752175162108, 204875755372586, 6868905893537535, 253432530143048034, 10246233216680784186, 452038162651568624259

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,4

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..17.

FORMULA

a(n) = Sum_{k=2..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].

CROSSREFS

Sequence in context: A340097 A237856 A016260 * A091947 A016195 A322540

Adjacent sequences: A011807 A011808 A011809 * A011811 A011812 A011813

KEYWORD

nonn

AUTHOR

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

EXTENSIONS

Offset corrected by Sean A. Irvine, Jun 28 2018

STATUS

approved