id:A008657 - OEIS Search Results

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Theta series of direct sum of 6 copies of hexagonal lattice.

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1, 36, 540, 4356, 20556, 60696, 137916, 325152, 658476, 1023012, 1999080, 3112560, 4446828, 7207992, 10755936, 13150296, 20963052, 27538056, 33706908, 47989008, 64050696, 70696224, 103079952 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`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	`Adjacent sequences: A008654 A008655 A008656 this_sequence A008658 A008659 A008660` `Sequence in context: A104671 A128986 A090408 this_sequence A134289 A081447 A099764`
	KEYWORD	`nonn,easy`
	AUTHOR	`njas`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

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