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A028998 Theta series of quadratic form with Gram matrix [ 4, 2, 2, 1; 2, 4, 1, 2; 2, 1, 6, 3; 1, 2, 3, 6 ]. 2
1, 0, 6, 12, 12, 0, 30, 12, 18, 36, 6, 24, 72, 24, 36, 12, 48, 24, 114, 24, 12, 84, 48, 36, 162, 0, 60, 120, 84, 48, 30, 48, 102, 120, 84, 12, 264, 72, 96, 144, 18, 48, 252, 60, 120, 36, 108, 60, 324, 96, 6, 192, 144, 96, 354, 24, 180, 216, 132, 96, 72, 96, 144, 300, 180, 24, 384 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

This is the 4-dimensional lattice E(15).

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^4 + 12*q^6 + 12*q^8 + 30*q^12 + 12*q^14 + 18*q^16 + 36*q^18 + 6*q^20 + ...

CROSSREFS

Sequence in context: A092461 A102809 A060479 * A285057 A040030 A315567

Adjacent sequences:  A028995 A028996 A028997 * A028999 A029000 A029001

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified May 25 03:14 EDT 2019. Contains 323539 sequences. (Running on oeis4.)