id:A145864 - OEIS Search Results

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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in two by two blocks.

+0
1

1, 2, 1, 4, 8, 25, 59, 294, 976, 6868, 36894, 351022, 2656603, 36966909, 391525649, 7896337875, 122564741600, 3503953133171, 77993874405982, 3210152559844391, 101979707965980254, 6040428902857902560, 276387013896712513044 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`Maximal 7 X 7 example` `.1.1.0.1.1.0.0` `.1.1.0.1.1.0.0` `.0.0.0.0.0.1.1` `.1.1.0.0.0.1.1` `.1.1.0.0.0.0.0` `.0.0.1.1.0.1.1` `.0.0.1.1.0.1.1`
	CROSSREFS	`Sequence in context: A008301 A113820 A133267 this_sequence A076014 A120458 A086933` `Adjacent sequences: A145861 A145862 A145863 this_sequence A145865 A145866 A145867`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 22 2008`

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

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