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Search: id:A008659
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| A008659 |
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Theta series of direct sum of 3 copies of D_4 lattice. |
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+0
1
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| 1, 72, 1800, 17568, 57096, 225072, 439200, 1210176, 1826568, 4269096, 5626800, 11595744, 13931424, 26733168, 30254400, 54917568, 58449672, 102229776, 106727400, 178279200, 178482096, 295282944, 289893600, 463416768, 445682592
(list; graph; listen)
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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. 119.
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LINKS
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Index entries for sequences related to D_4 lattice
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PROGRAM
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(PARI) a(n)=if(n<1, n==0, 72*(sigma(n, 5)-if(n%2, 0, 8*sigma(n/2, 5)))) /* Michael Somos, Jul 16 2004 */
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CROSSREFS
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Sequence in context: A128800 A008391 A037251 this_sequence A014704 A035118 A017788
Adjacent sequences: A008656 A008657 A008658 this_sequence A008660 A008661 A008662
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KEYWORD
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nonn,easy
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AUTHOR
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njas
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