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Search: id:A122266
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| A122266 |
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Expansion of f(-q)^2*Q(q) in powers of q. |
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+0
1
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| 1, 238, 1679, 2162, 2401, -6958, -1442, -23040, 1918, -9362, 14641, 0, 80640, -20398, 28083, 64078, -38398, -69120, 0, -90482, -58562, 0, -241920, 100558, 146879, 0, -193438, 399602, 104638, 114002, 130321, 24242, 0, 107282, -276962, 351118
(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 Q(q) (g.f. A004009) 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, 240*sigma(k, 3)*x^k, 1+A), n))}
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CROSSREFS
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Sequence in context: A069420 A129124 A124169 this_sequence A013477 A013473 A140032
Adjacent sequences: A122263 A122264 A122265 this_sequence A122267 A122268 A122269
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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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