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A135469 Denominators of expansion of eta(5t)^2*eta(10t)^(13/5)*eta(20t)^(-9/5)*eta(40t)^(6/5). 1
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 1, 1, 1, 1, 5, 1, 1, 1, 1, 25, 1, 1, 1, 1, 25, 1, 1, 1, 1, 125, 1, 1, 1, 1, 125, 1, 1, 1, 1, 625, 1, 1, 1, 1, 625, 1, 1, 1, 1, 15625, 1, 1, 1, 1, 15625, 1, 1, 1, 1, 78125, 1, 1, 1, 1, 78125, 1, 1, 1, 1, 390625, 1, 1, 1, 1, 390625, 1, 1, 1, 1, 1953125, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,13

LINKS

Table of n, a(n) for n=2..85.

T. Ishikawa, Congruences between binomial coefficients binom(2f,f) and Fourier coefficients of certain eta-products, Hiroshima Math. J. 22 (1992), no. 3, 583-590.

EXAMPLE

q^2-2*q^7-18/5*q^12+36/5*q^17+122/25*q^22-144/25*q^27-...

CROSSREFS

Cf. A135468 (numerators)

Sequence in context: A129398 A109009 A060904 * A170817 A170818 A046622

Adjacent sequences:  A135466 A135467 A135468 * A135470 A135471 A135472

KEYWORD

nonn,frac

AUTHOR

N. J. A. Sloane, Feb 07 2008

STATUS

approved

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Last modified May 17 16:03 EDT 2021. Contains 343980 sequences. (Running on oeis4.)