A008656 - OEIS

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A008656

Theta series of direct sum of 5 copies of hexagonal lattice.

1, 30, 360, 2190, 7230, 14976, 32760, 72060, 92520, 177150, 280800, 351360, 527790, 856860, 864720, 1362816, 1850430, 2004480, 2657160, 3909660, 3609216, 5260380, 6588000, 6716160, 8419320 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`The hexagonal lattice is the familiar 2-dimensional lattice in which each point has 6 neighbors. This is sometimes called the triangular lattice.`
	REFERENCES	`J. H. Conway and N. J. A. Sloane, Sphere Packings, Lattices and Groups, Springer-Verlag, p. 110.`
	LINKS	`G. Nebe and N. J. A. Sloane, Home page for hexagonal (or triangular) lattice A2`
	CROSSREFS	`Sequence in context: A125418 A107916 A091775 * A179717 A086864 A138441` `Adjacent sequences: A008653 A008654 A008655 * A008657 A008658 A008659`
	KEYWORD	`nonn,easy`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 17 03:45 EST 2012. Contains 205978 sequences.