id:A144241 - OEIS Search Results

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Number of n X n binary arrays, symmetric about the diagonal and under 90 degree rotation, with every 1 adjacent to at least one other 1 both bishopwise and rookwise but with no three 1s in a row bishopwise or rookwise.

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1, 2, 1, 3, 2, 4, 4, 13, 10, 65, 30, 231, 168, 1370, 1317, 17525, 10846, 191939, 133498, 2802218, 2431795, 73051050, 54458173, 2202863847, 1575946900, 84041510893, 69906212126, 5035951361562, 4061748253676, 385626222267420 (list; graph; listen)

	OFFSET	`1,2`
	CROSSREFS	`Sequence in context: A159072 A116928 A034391 this_sequence A094173 A026272 A022447` `Adjacent sequences: A144238 A144239 A144240 this_sequence A144242 A144243 A144244`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Sep 15 2008`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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