id:A006861 - OEIS Search Results

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Number of directed site animals on hexagonal lattice.
(Formerly M0786)

+0
1

1, 2, 3, 6, 11, 21, 40, 77, 149, 289, 563, 1099, 2152, 4222, 8299, 16339, 32217, 63612, 125753, 248870, 493015, 977576, 1940042, 3853117, 7658211, 15231219, 30312012, 60360046, 120260317 (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	`D. Dhar et al., Enumeration of directed site animals on two-dimensional lattices, J. Phys. A 15 (1982), L279-L284.`
	LINKS	`G. Nebe and N. J. A. Sloane, Home page for hexagonal (or triangular) lattice A2`
	CROSSREFS	`Adjacent sequences: A006858 A006859 A006860 this_sequence A006862 A006863 A006864` `Sequence in context: A132832 A079116 A109222 this_sequence A052956 A008930 A026742`
	KEYWORD	`nonn`
	AUTHOR	`Simon Plouffe, njas`

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Last modified October 7 08:31 EDT 2008. Contains 144667 sequences.

AT&T Labs Research