id:A145949 - OEIS Search Results

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Number of n X n binary arrays symmetric under 90 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, 1, 3, 15, 35, 85, 321, 1353, 7451, 43415, 311247, 2524635, 23996463, 265026943, 3465054275, 52737773951, 953864284885, 19856088270267, 488084993258793 (list; graph; listen)

	OFFSET	`1,5`
	EXAMPLE	`Maximal 8 X 8 example` `.1.1.0.0.0.1.1.1` `.1.0.1.0.1.0.0.1` `.1.0.1.0.1.1.1.0` `.0.1.1.0.0.0.0.0` `.0.0.0.0.0.1.1.0` `.0.1.1.1.0.1.0.1` `.1.0.0.1.0.1.0.1` `.1.1.1.0.0.0.1.1`
	CROSSREFS	`Sequence in context: A009261 A102790 A000466 this_sequence A015809 A015715 A019009` `Adjacent sequences: A145946 A145947 A145948 this_sequence A145950 A145951 A145952`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 25 2008`

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Last modified December 17 19:39 EST 2009. Contains 170821 sequences.

AT&T Labs Research