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Search: id:A122267
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| A122267 |
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Expansion of f(-q)^2*R(q) in powers of q. |
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+0
1
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| 1, -506, -15625, -89206, -271151, -420838, -638066, 0, 56446, 2172742, 1771561, 5443200, 0, 7082714, -4570773, -98282, -13055614, 0, -29937600, 4072822, -26439842, 0, 0, 26266966, -24137569, 70761600, 38871506, 7906250, 52240606, 56926298, -29158919
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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f(-q) (g.f. A010815) and R(q) (g.f. A013973) are Ramanujan q-series.
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LINKS
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S. R. Finch, Powers of Euler's q-Series, (arXiv:math.NT/0701251).
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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)^2*sum(k=1, n, -504*sigma(k, 5)*x^k, 1+A), n))}
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CROSSREFS
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Adjacent sequences: A122264 A122265 A122266 this_sequence A122268 A122269 A122270
Sequence in context: A003791 A003925 A126846 this_sequence A023913 A035848 A028685
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KEYWORD
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sign
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AUTHOR
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Michael Somos, Aug 28 2006
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