A373121 Expansion of B(x)^2, where B(x) is the g.f. of A230322.

1, 0, 2, -2, 1, -2, 1, 2, -2, 4, -6, 4, -4, 0, 5, -6, 13, -14, 9, -10, 1, 12, -16, 26, -32, 24, -19, 2, 22, -34, 57, -64, 48, -40, 4, 44, -70, 108, -124, 98, -73, 6, 79, -132, 205, -228, 181, -134, 13, 142, -245, 360, -404, 330, -230, 18, 241, -428, 630, -694, 567, -394, 35, 410, -735, 1054

Offset

0,3

Links

Table of n, a(n) for n=0..65.

Formula

G.f.: C(x) / D(x), where C(x) is the g.f. of A375148 and D(x) is the g.f. of A375149.

Prog

(PARI) my(N=70, x='x+O('x^N)); Vec(prod(k=1, N, (1-x^(7*k-3))*(1-x^(7*k-4))/((1-x^(7*k-2))*(1-x^(7*k-5))))^2)

Crossrefs

Cf. A230322, A375148, A375149.

Sequence in context: A024317 A024880 A029424 * A061498 A373823 A106029

Adjacent sequences: A373118 A373119 A373120 * A373122 A373123 A373124

Keyword

sign

Author

Seiichi Manyama, Aug 03 2024

Status

approved