id:A060521 - OEIS Search Results

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Number of 3 X n grids of black and white cells, no 3 of same color vertically or horizontally contiguous.

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6, 36, 102, 378, 1260, 4374, 14946, 51384, 176238, 605022, 2076288, 7126302, 24457806, 83942100, 288096942 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`Almost surely satisfies a(n+4) = 2a(n+3) + 5a(n+2) - a(n).`
	CROSSREFS	`Adjacent sequences: A060518 A060519 A060520 this_sequence A060522 A060523 A060524` `Sequence in context: A080857 A108158 A086113 this_sequence A036141 A061804 A083374`
	KEYWORD	`nonn`
	AUTHOR	`Tom Womack (tom(AT)womack.net)`

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