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A249687 Coefficients of the j-function, squared: a(n) = A000521(n)^2. 0
1, 553536, 38763309456, 461981718937600, 747014438142000900, 409894695538614337536, 111023999702812768360000, 18079702144559278473609216, 1994247119540837731954644225 (list; graph; refs; listen; history; text; internal format)
OFFSET

-1,2

LINKS

Table of n, a(n) for n=-1..7.

FORMULA

a(n) ~ exp(8*Pi*sqrt(n)) / (2*n^(3/2)). - Vaclav Kotesovec, Apr 09 2018

MATHEMATICA

CoefficientList[Series[(2^16 + x*QPochhammer[-1, x]^24)^3 / (2 * QPochhammer[-1, x])^24, {x, 0, 15}], x]^2 (* Vaclav Kotesovec, Apr 09 2018 *)

CROSSREFS

Cf. A000521.

Sequence in context: A188486 A204571 A253614 * A267600 A345639 A346352

Adjacent sequences: A249684 A249685 A249686 * A249688 A249689 A249690

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Nov 07 2014

STATUS

approved

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Last modified February 5 08:15 EST 2023. Contains 360082 sequences. (Running on oeis4.)