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A029682 Theta series of quadratic form with Gram matrix [ 2, 1, 0; 1, 2, 1; 0, 1, 4 ]. 1
1, 6, 6, 12, 18, 0, 12, 24, 18, 18, 6, 24, 24, 24, 12, 8, 42, 12, 30, 48, 0, 24, 36, 24, 36, 6, 12, 48, 60, 24, 0, 48, 42, 24, 36, 12, 54, 48, 12, 48, 18, 24, 24, 84, 48, 0, 60, 24, 48, 42, 6, 72, 72, 24, 48, 0, 36, 48, 60, 48, 20, 48, 24, 72, 90, 12, 24, 108, 36, 24, 0, 48, 90, 60 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

This is the trigonal R lattice (the even holotype) of dimension 3.

LINKS

John Cannon, Table of n, a(n) for n = 0..5000

G. Nebe and N. J. A. Sloane, Home page for this lattice

EXAMPLE

1 + 6*q^2 + 6*q^4 + 12*q^6 + 18*q^8 + 12*q^12 + 24*q^14 + 18*q^16 + 18*q^18 + ...

CROSSREFS

Sequence in context: A046625 A315787 A309458 * A014201 A315788 A315789

Adjacent sequences:  A029679 A029680 A029681 * A029683 A029684 A029685

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified October 21 03:38 EDT 2021. Contains 348141 sequences. (Running on oeis4.)