id:A146037 - 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 el 1,1 1,2 1,3 2,3 3,3 in any orientation.

+0
1

1, 1, 1, 3, 7, 19, 89, 399, 1939, 11793, 102715, 985113, 13989079, 211198639, 4331591655, 98297746517, 2965968725989, 100683520176799 (list; graph; listen)

	OFFSET	`1,4`
	EXAMPLE	`Maximal 8 X 8 example` `.0.0.0.0.0.1.1.1` `.1.1.1.0.0.0.0.1` `.1.0.0.1.1.1.0.1` `.1.0.1.0.0.1.0.0` `.0.0.1.0.0.1.0.1` `.1.0.1.1.1.0.0.1` `.1.0.0.0.0.1.1.1` `.1.1.1.0.0.0.0.0`
	CROSSREFS	`Sequence in context: A066237 A135741 A163571 this_sequence A128024 A075487 A118128` `Adjacent sequences: A146034 A146035 A146036 this_sequence A146038 A146039 A146040`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 26 2008`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

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