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A320245 G.f.: Product_{k>=1, j>=1} 1/((1 + x^(k*j)) * (1 - x^(k*j))^2). 2
1, 1, 4, 6, 17, 25, 59, 89, 187, 284, 545, 828, 1505, 2270, 3930, 5904, 9861, 14695, 23827, 35248, 55775, 81882, 126874, 184870, 281467, 407065, 610193, 876282, 1295892, 1848144, 2700398, 3825912, 5530337, 7786022, 11145541, 15597196, 22131170, 30792303 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Convolution of A288007 and A320236.

LINKS

Vaclav Kotesovec, Table of n, a(n) for n = 0..10000

MATHEMATICA

nmax = 50; CoefficientList[Series[Product[1/((1+x^(k*j))*(1-x^(k*j))^2), {k, 1, nmax}, {j, 1, Floor[nmax/k]+1}], {x, 0, nmax}], x]

CROSSREFS

Cf. A158441, A320236, A320238.

Sequence in context: A226634 A105271 A024305 * A034492 A125691 A302878

Adjacent sequences:  A320242 A320243 A320244 * A320246 A320247 A320248

KEYWORD

nonn

AUTHOR

Vaclav Kotesovec, Oct 08 2018

STATUS

approved

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Last modified April 6 21:24 EDT 2020. Contains 333286 sequences. (Running on oeis4.)