A284504 - OEIS

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A284504

Expansion of Product_{k>=0} (1 - x^(7*k+6)) in powers of x.

1, 0, 0, 0, 0, 0, -1, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0, 0, 0, 1, -1, 0, 0, 0, 0, 0, 1, -1, 0, 0, 0, 0, 0, 2, -1, 0, 0, 0, 0, -1, 2, -1, 0, 0, 0, 0, -1, 3, -1, 0, 0, 0, 0, -2, 3, -1, 0, 0, 0, 0, -3, 4, -1, 0, 0, 0, 1, -4, 4, -1, 0, 0, 0, 1, -5, 5, -1, 0, 0, 0, 2, -7, 5

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

OFFSET

0,34

LINKS

Seiichi Manyama, Table of n, a(n) for n = 0..10000

FORMULA

a(n) = -(1/n) * Sum_{k=1..n} A284105(k) * a(n-k), a(0) = 1.

MATHEMATICA

CoefficientList[Series[Product[1 - x^(7k + 6), {k, 0, 100}], {x, 0, 100}], x] (* Indranil Ghosh, Mar 28 2017 *)

PROG

(PARI) Vec(prod(k=0, 100, 1 - x^(7*k + 6)) + O(x^101)) \\ Indranil Ghosh, Mar 28 2017

CROSSREFS