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Search: id:A002273
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| A002273 |
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Theta series of 28-dimensional Quebbemann lattice. |
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+0
1
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| 1, 0, 98280, 19138560, 805208040, 14651449344, 156717687840, 1162883174400, 6596666916840, 30507984568320, 119992701299184, 414348381296640, 1283840894706720, 3635166831206400, 9523995863722560
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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This lattice has the highest possible density of any 28-dimensional even lattice of level at most 2.
Numbers so far are also terms of A002520. - R. Stephan, Aug 23 2004
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REFERENCES
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H.-G. Quebbemann, Modular lattices in Euclidean spaces, J. Number Theory, 54 (1995), 190-202.
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EXAMPLE
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1 + 98280*q^2 + 19138560*q^3 + 805208040*q^4 + 14651449344*q^5 + 156717687840*q^6 + ...
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CROSSREFS
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Sequence in context: A145659 A022214 A109185 this_sequence A093214 A052090 A163679
Adjacent sequences: A002270 A002271 A002272 this_sequence A002274 A002275 A002276
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KEYWORD
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nonn,nice,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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