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Search: id:A135467
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| A135467 |
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Expansion of q^(-3/4) * eta(q)^2 * eta(q^2)^4 * eta(q^8)^4 / eta(q^4)^6 in powers of q. |
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+0
1
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| 1, -2, -5, 10, 13, -22, -30, 40, 60, -78, -101, 132, 170, -210, -273, 342, 409, -514, -625, 748, 917, -1102, -1300, 1570, 1863, -2186, -2589, 3034, 3540, -4148, -4838, 5584, 6489, -7500, -8621, 9958, 11417, -13046, -14960, 17066, 19417, -22122, -25119, 28450, 32253, -36478
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OFFSET
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0,2
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REFERENCES
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Ishikawa, T., Congruences between binomial coefficients binom(2f,f) and Fourier coefficients of certain eta-products, Hiroshima Math. J. 22 (1992), no. 3, 583-590.
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FORMULA
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Euler transform of period 8 sequence [ -2, -6, -2, 0, -2, -6, -2, -4, ...]. - Michael Somos Mar 01 2008
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EXAMPLE
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q^3 - 2*q^7 - 5*q^11 + 10*q^15 + 13*q^19 - 22*q^23 - 30*q^27 + ...
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PROGRAM
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(PARI) {a(n) = local(A); if( n<0, 0, A = x * O(x^n); polcoeff( (eta(x + A) * eta(x^2 + A)^2 / eta(x^4 + A)^3 * eta(x^8 + A)^2)^2, n))} /* Michael Somos Mar 01 2008 */
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CROSSREFS
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Adjacent sequences: A135464 A135465 A135466 this_sequence A135468 A135469 A135470
Sequence in context: A031396 A003654 A047617 this_sequence A018571 A064233 A051952
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KEYWORD
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sign
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Feb 07 2008
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