id:A068271 - OEIS Search Results

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1/4 the number of colorings of an n X n rhombic hexagonal array with 4 colors.

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1, 12, 264, 11424, 1008576, 184910592, 71033971200, 57469424744448 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Terms for rhombic- and staggered- hexagonal arrays are the same for n in 1..4.`
	CROSSREFS	`Cf. A068239-A068305, A000332, A002417, A027441.` `Sequence in context: A138451 A113672 A035265 this_sequence A068283 A003390 A107485` `Adjacent sequences: A068268 A068269 A068270 this_sequence A068272 A068273 A068274`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Feb 24 2002`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.