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Search: id:A105097
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| A105097 |
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Expansion of Delta(tau)/E_4(tau)^2. |
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+0
1
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| 1, -504, 180252, -56364992, 16415391870, -4574618335008, 1237162549543256, -327377686829760000, 85212608926827807477, -21894492009015306942480, 5567179862617316105012532, -1403483985988949037403977984
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Borcherds, Richard E., Automorphic forms with singularities on Grassmannians, Invent. Math. 132 (1998), 491-562.
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PROGRAM
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(PARI) {a(n)=if(n<1, 0, polcoeff( x*eta(x+x*O(x^n))^24/sum(k=1, n, 480*sigma(k, 7)*x^k, 1), n))} /* Michael Somos Apr 07 2005 */
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CROSSREFS
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Sequence in context: A013973 A012744 A035293 this_sequence A000706 A068299 A003798
Adjacent sequences: A105094 A105095 A105096 this_sequence A105098 A105099 A105100
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KEYWORD
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sign,easy
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AUTHOR
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njas, Apr 07 2005
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EXTENSIONS
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More terms from Michael Somos Apr 07 2005
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