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A029681
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Theta series of quadratic form with Gram matrix [ 2, 1, 0; 1, 2, 1; 0, 1, 3 ].
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2
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1, 0, 6, 6, 0, 6, 6, 12, 6, 0, 6, 12, 6, 6, 24, 12, 0, 0, 18, 6, 6, 14, 12, 24, 6, 0, 18, 24, 12, 12, 12, 12, 6, 0, 12, 42, 0, 12, 30, 12, 6, 0, 42, 12, 12, 18, 12, 36, 6, 0, 30, 12, 6, 24, 24, 12, 24, 0, 24, 30, 12, 6, 36, 60, 0, 0, 12, 24, 0, 12, 42, 36, 18, 0, 24, 30, 6, 48, 36, 12, 6, 0, 24
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| The Gram matrix [ 2, 1, 1; 1, 2, 1; 1, 1, 3 ] defines the same lattice.
This is the trigonal R lattice (the classical holotype) of dimension 3.
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LINKS
| John Cannon, Table of n, a(n) for n = 0..9999
G. Nebe and N. J. A. Sloane, Home page for this lattice
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EXAMPLE
| 1 + 6*q^2 + 6*q^3 + 6*q^5 + 6*q^6 + 12*q^7 + 6*q^8 + 6*q^10 + 12*q^11 + 6*q^12 + ...
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CROSSREFS
| Sequence in context: A197013 A081825 A028969 * A109917 A153629 A154155
Adjacent sequences: A029678 A029679 A029680 * A029682 A029683 A029684
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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