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

Offset: 0

Author

Seiichi Manyama, Mar 28 2017

Keywords

• sign
• look

Links

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

Crossrefs

Cf. Product_{k>=0} (1 - x^(7*k+m)): A284499 (m=1), A284500 (m=2), A284501 (m=3), A284502 (m=4), A284503 (m=5), this sequence (m=6).

Cf. A281245.

Programs

Mathematica

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

PARI

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

Formula

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