id:A006778 - OEIS Search Results

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Number of n-step spirals on hexagonal lattice.
(Formerly M2652)

+0
1

1, 3, 7, 15, 31, 59, 110, 198, 347, 592, 997, 1641, 2666, 4266, 6741, 10525, 16268, 24882, 37717, 56683, 84504, 125031, 183716, 268125, 388873, 560647, 803723, 1146013, 1625731 (list; graph; listen)

	OFFSET	`1,2`
	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	`G. Szekeres and A. J. Guttmann, Spiral self-avoiding walks on the triangular lattice, J. Phys. A 20 (1987), 481-493.`
	LINKS	`G. Nebe and N. J. A. Sloane, Home page for hexagonal (or triangular) lattice A2`
	CROSSREFS	`Adjacent sequences: A006775 A006776 A006777 this_sequence A006779 A006780 A006781` `Sequence in context: A043729 A137170 A023424 this_sequence A007574 A034480 A057703`
	KEYWORD	`nonn`
	AUTHOR	`njas`

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.

AT&T Labs Research