id:A145950 - OEIS Search Results

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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected in a 3X2 elbow 1,1 1,2 1,3 2,3 in any orientation.

+0
1

1, 1, 1, 9, 31, 205, 1307, 12227, 171281, 3266929, 85166971, 3120438693, 149314103237, 10059913232521, 894685834014771 (list; graph; listen)

	OFFSET	`1,4`
	EXAMPLE	`Maximal 8 X 8 example` `.0.0.0.1.1.0.1.1` `.1.0.0.1.0.1.0.1` `.1.0.0.1.0.1.0.1` `.1.1.0.0.1.1.0.0` `.0.0.1.1.0.0.1.1` `.1.0.1.0.1.0.0.1` `.1.0.1.0.1.0.0.1` `.1.1.0.1.1.0.0.0`
	CROSSREFS	`Sequence in context: A118444 A048374 A140323 this_sequence A159279 A048547 A141573` `Adjacent sequences: A145947 A145948 A145949 this_sequence A145951 A145952 A145953`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 25 2008`

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Last modified December 19 12:50 EST 2009. Contains 171053 sequences.