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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
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
Sequence in context: A343758 A024305 A342231 * A337208 A034492 A125691
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Oct 08 2018
STATUS
approved

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Last modified May 21 07:02 EDT 2024. Contains 372729 sequences. (Running on oeis4.)