A029679 Theta series of quadratic form with Gram matrix [ 2, 0, 0; 0, 2, 1; 0, 1, 4 ].

1, 4, 8, 8, 8, 16, 8, 2, 24, 20, 8, 16, 24, 16, 4, 16, 16, 40, 24, 8, 40, 0, 16, 32, 24, 28, 24, 32, 6, 32, 16, 16, 56, 48, 16, 0, 40, 32, 40, 16, 24, 56, 0, 16, 48, 48, 16, 48, 56, 4, 40, 16, 40, 64, 32, 16, 12, 64, 32, 40, 48, 16, 48, 10, 32, 80, 16, 32, 80, 32, 0, 48, 72, 56, 32, 40

Offset

0,2

Comments

This is the digonal C 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 + 4*q^2 + 8*q^4 + 8*q^6 + 8*q^8 + 16*q^10 + 8*q^12 + 2*q^14 + 24*q^16 + ...

Crossrefs

Sequence in context: A331067 A040012 A054006 * A304651 A187768 A344984

Adjacent sequences: A029676 A029677 A029678 * A029680 A029681 A029682

Keyword

nonn

Author

N. J. A. Sloane.

Status

approved