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Search: id:A029673
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| A029673 |
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Theta series of quadratic form with Gram matrix [ 2, 0, 1; 0, 4, 2; 1, 2, 4 ]. |
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+0
1
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| 1, 2, 10, 4, 10, 2, 16, 4, 26, 10, 0, 12, 20, 4, 36, 0, 26, 12, 30, 4, 10, 8, 32, 20, 32, 2, 40, 16, 20, 20, 12, 8, 58, 8, 20, 0, 50, 12, 64, 16, 0, 16, 40, 12, 60, 6, 36, 20, 52, 14, 10, 16, 20, 28, 64, 4, 84, 16, 40, 20, 0, 12, 72, 20, 58, 0, 40, 12, 60, 16, 16, 32, 78, 12, 80, 4, 20
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Alternatively, this is the quadratic form with Gram matrix [ 2, 1, 1; 1, 4, 2; 1, 2, 4 ].
This is the digonal I lattice (the even holotype) of dimension 3.
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LINKS
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John Cannon, Table of n, a(n) for n = 0..5000
G. Nebe and N. J. A. Sloane, Home page for this lattice
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EXAMPLE
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1 + 2*q^2 + 10*q^4 + 4*q^6 + 10*q^8 + 2*q^10 + 16*q^12 + 4*q^14 + 26*q^16 + ...
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CROSSREFS
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Sequence in context: A120862 A153273 A102512 this_sequence A054790 A140393 A000170
Adjacent sequences: A029670 A029671 A029672 this_sequence A029674 A029675 A029676
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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