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 A261637 Expansion of Product_{k>=0} (1+x^(3*k+1))^4. 1
 1, 4, 6, 4, 5, 16, 24, 20, 26, 48, 56, 60, 98, 132, 130, 168, 253, 288, 324, 448, 539, 588, 780, 1000, 1086, 1304, 1690, 1916, 2205, 2812, 3274, 3648, 4507, 5396, 6018, 7200, 8674, 9680, 11250, 13616, 15425, 17532, 20962, 23988, 26960, 31868, 36836, 41164 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Table of n, a(n) for n=0..47. FORMULA a(n) ~ exp(2*Pi*sqrt(n)/3) / (2^(1/3) * sqrt(3) * n^(3/4)). MATHEMATICA nmax=50; CoefficientList[Series[Product[(1+x^(3*k+1))^4, {k, 0, nmax}], {x, 0, nmax}], x] CROSSREFS Cf. A261612, A261615, A261638. Sequence in context: A014110 A266491 A323016 * A366558 A091651 A199865 Adjacent sequences: A261634 A261635 A261636 * A261638 A261639 A261640 KEYWORD nonn AUTHOR Vaclav Kotesovec, Aug 27 2015 STATUS approved

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Last modified August 15 11:07 EDT 2024. Contains 375173 sequences. (Running on oeis4.)