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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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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; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| 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
| 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
| 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
| Sequence in context: A153273 A102512 A196364 * A189881 A189872 A199832
Adjacent sequences: A029670 A029671 A029672 * A029674 A029675 A029676
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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