A249687 Coefficients of the j-function, squared: a(n) = A000521(n)^2.

1, 553536, 38763309456, 461981718937600, 747014438142000900, 409894695538614337536, 111023999702812768360000, 18079702144559278473609216, 1994247119540837731954644225

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