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A261629
Expansion of Product_{k>=0} 1/(1-x^(4*k+1))^2.
3
1, 2, 3, 4, 5, 8, 11, 14, 17, 22, 30, 38, 46, 56, 70, 88, 106, 126, 153, 186, 224, 264, 312, 372, 440, 516, 603, 708, 830, 964, 1117, 1296, 1503, 1734, 1992, 2292, 2638, 3024, 3453, 3942, 4504, 5134, 5831, 6616, 7511, 8518, 9631, 10872, 12274, 13848, 15592
OFFSET
0,2
FORMULA
a(n) ~ exp(Pi*sqrt(n/3)) * Gamma(1/4)^2 / (8 * Pi^(3/2) * sqrt(n)).
MATHEMATICA
nmax=60; CoefficientList[Series[Product[1/(1-x^(4*k+1))^2, {k, 0, nmax}], {x, 0, nmax}], x]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Aug 27 2015
STATUS
approved