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Search: id:A014704
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| A014704 |
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Expansion of ((theta_2)^4+(theta_3)^4)/(Delta_24)^2. |
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+0
1
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| 1, 72, 2400, 52576, 870732, 11739984, 134825216, 1359259200, 12290396058, 101268020984, 769721861376, 5449376818656, 36216000728200, 227395735413552, 1356190070338560, 7717657198319936, 42069113073665703, 220400042813587800
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OFFSET
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0,2
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REFERENCES
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J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 105.
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PROGRAM
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(PARI) {a(n)=local(A); if(n<0, 0, A=x*O(x^n); polcoeff( sum(k=1, n, 24*sumdiv(k, d, d%2*d)*x^k, 1+A)/eta(x+A)^48, n))} /* Michael Somos Feb 15 2006 */
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CROSSREFS
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Sequence in context: A008391 A037251 A008659 this_sequence A035118 A017788 A035731
Adjacent sequences: A014701 A014702 A014703 this_sequence A014705 A014706 A014707
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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