id:A146052 - OEIS Search Results

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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 2X2 block with tail 1,1 1,2 1,3 2,2 2,3 in any orientation.

+0
1

1, 1, 1, 1, 1, 13, 33, 59, 183, 775, 3549, 21203, 124205, 885931, 6938155, 65072235, 697161911, 8870657391, 129325569203, 2224950934319, 42682217569275, 961782024725197, 24665663177266467 (list; graph; listen)

	OFFSET	`1,6`
	EXAMPLE	`Maximal 8 X 8 example` `.1.1.0.1.0.1.1.1` `.1.1.0.1.1.0.1.1` `.1.0.0.1.1.0.0.0` `.0.1.1.0.0.1.1.1` `.1.1.1.0.0.1.1.0` `.0.0.0.1.1.0.0.1` `.1.1.0.1.1.0.1.1` `.1.1.1.0.1.0.1.1`
	CROSSREFS	`Sequence in context: A140678 A050659 A123161 this_sequence A082109 A024839 A146177` `Adjacent sequences: A146049 A146050 A146051 this_sequence A146053 A146054 A146055`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 26 2008`

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Last modified December 4 15:11 EST 2009. Contains 170347 sequences.

AT&T Labs Research