id:A145959 - 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 a zee 1,1 1,2 2,2 2,3 in any orientation.

+0
1

1, 1, 1, 5, 17, 75, 405, 2821, 26895, 365651, 6440881, 149278281, 4554728635, 183204987539, 9796495036771, 702723336742467 (list; graph; listen)

	OFFSET	`1,4`
	EXAMPLE	`Maximal 8 X 8 example` `.0.1.1.0.0.0.1.0` `.1.1.0.0.1.0.1.1` `.0.0.0.1.1.0.0.1` `.1.1.0.1.0.1.1.0` `.0.1.1.0.1.0.1.1` `.1.0.0.1.1.0.0.0` `.1.1.0.1.0.0.1.1` `.0.1.0.0.0.1.1.0`
	CROSSREFS	`Sequence in context: A149734 A149735 A149736 this_sequence A126956 A149737 A149738` `Adjacent sequences: A145956 A145957 A145958 this_sequence A145960 A145961 A145962`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 25 2008`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.