A327690 - OEIS

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A327690

Expansion of Product_{k>=1} B(x^k), where B(x) is the g.f. of A003114.

1, 1, 2, 3, 6, 8, 14, 19, 31, 43, 64, 88, 131, 176, 250, 337, 471, 626, 859, 1133, 1532, 2008, 2674, 3479, 4595, 5933, 7745, 9952, 12888, 16451, 21142, 26842, 34260, 43283, 54878, 68993, 87017, 108884, 136564, 170191, 212441, 263646, 327616, 405034, 501203, 617423, 760964

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

OFFSET

0,3

LINKS

Vaclav Kotesovec, Table of n, a(n) for n = 0..10000 (terms 0..1000 from Seiichi Manyama)

FORMULA

G.f.: Product_{i>=1} Product_{j>=1} 1 / ((1-x^(i*(5*j-1))) * (1-x^(i*(5*j-4)))).

MATHEMATICA

nmax = 50; CoefficientList[Series[Product[1/(QPochhammer[x^(5*j - 4)] * QPochhammer[x^(5*j - 1)]), {j, 1, nmax}], {x, 0, nmax}], x] (* Vaclav Kotesovec, Sep 23 2019 *)

CROSSREFS

Cf. A003114, A327688, A327691.

Sequence in context: A212214 A089426 A167934 * A182269 A321360 A321566

Adjacent sequences: A327687 A327688 A327689 * A327691 A327692 A327693

KEYWORD

nonn

AUTHOR

Seiichi Manyama, Sep 22 2019

STATUS

approved