A284502 Expansion of Product_{k>=0} (1 - x^(7*k+4)) in powers of x.

1, 0, 0, 0, -1, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0, 1, 0, 0, -1, 0, 0, 0, 1, 0, 0, -1, 0, 0, 0, 2, 0, 0, -1, -1, 0, 0, 2, 0, 0, -1, -1, 0, 0, 3, 0, 0, -1, -2, 0, 0, 3, 0, 0, -1, -3, 0, 0, 4, 1, 0, -1, -4, 0, 0, 4, 1, 0, -1, -5, 0, 0, 5, 2, 0, -1, -7, 0, 0, 5, 3, 0, -1, -8

Offset

0,30

Links

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

Formula

a(n) = -(1/n) * Sum_{k=1..n} A284445(k) * a(n-k), a(0) = 1.

Mathematica

CoefficientList[Series[Product[1 - x^(7k + 4), {k, 0, 100}], {x, 0, 100}], x] (* Indranil Ghosh, Mar 28 2017 *)

Prog

(PARI) Vec(prod(k=0, 100, 1 - x^(7*k + 4)) + O(x^101)) \\ Indranil Ghosh, Mar 28 2017

Crossrefs

Cf. Product_{k>=0} (1 - x^(7*k+m)): A284499 (m=1), A284500 (m=2), A284501 (m=3), this sequence (m=4), A284503 (m=5), A284504 (m=6).

Cf. A281456.

Sequence in context: A124762 A258590 A057558 * A281456 A284501 A281457

Adjacent sequences: A284499 A284500 A284501 * A284503 A284504 A284505

Keyword

sign,look

Author

Seiichi Manyama, Mar 28 2017

Status

approved