id:A146004 - 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 3X3 plus 2,1 2,2 2,3 1,2 3,2.

+0
1

1, 1, 2, 1, 4, 7, 21, 46, 195, 635, 3736, 16722, 140702, 874897, 10218521, 89150959, 1456627028, 17686096248, 403908679949, 6882785245717, 219237062845023, 5210440958351021, 232082441606979544, 7714095184686817142 (list; graph; listen)

	OFFSET	`1,3`
	EXAMPLE	`Maximal 8 X 8 example` `.0.0.0.0.0.0.1.0` `.0.0.0.0.0.1.1.1` `.0.0.1.0.0.0.1.0` `.0.1.1.1.0.1.0.0` `.0.0.1.0.1.1.1.0` `.0.1.0.0.0.1.0.0` `.1.1.1.0.0.0.0.0` `.0.1.0.0.0.0.0.0`
	CROSSREFS	`Sequence in context: A139769 A007839 A045625 this_sequence A001933 A038557 A011234` `Adjacent sequences: A146001 A146002 A146003 this_sequence A146005 A146006 A146007`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 26 2008`

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

AT&T Labs Research