A014457 - OEIS

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A014457

Theta series of quadratic form (or lattice) with Gram matrix [ 2, 1, 0; 1, 3, 1; 0, 1, 2 ].

1, 0, 4, 8, 4, 0, 0, 16, 6, 0, 16, 8, 8, 0, 0, 16, 12, 0, 20, 24, 8, 0, 0, 16, 8, 0, 16, 32, 16, 0, 0, 32, 6, 0, 32, 16, 12, 0, 0, 16, 24, 0, 32, 40, 8, 0, 0, 32, 24, 0, 20, 16, 24, 0, 0, 48, 0, 0, 48, 24, 16, 0, 0, 48, 12, 0, 32, 56, 16, 0, 0, 16, 30, 0, 16, 40, 24, 0, 0, 32 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	COMMENTS	`This is the tetragonal I lattice (the classical holotype) of dimension 3.`
	LINKS	`John Cannon, Table of n, a(n) for n = 0..10000` `G. Nebe and N. J. A. Sloane, Home page for this lattice`
	EXAMPLE	`1 + 4q^2 + 8q^3 + 4q^4 + 16q^7 + 6q^8 + 16q^10 + 8q^11 + 8q^12 + 16*q^15 + ...`
	CROSSREFS	`Sequence in context: A103647 A033197 A124002 * A092511 A045816 A085991` `Adjacent sequences: A014454 A014455 A014456 * A014458 A014459 A014460`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 15 16:49 EST 2012. Contains 205824 sequences.