id:A146661 - OEIS Search Results

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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0111-0001 pattern in any orientation.

+0
1

1, 1, 1, 1, 3, 9, 23, 67, 379, 2563, 18843, 171357, 2142397, 34085501, 656314291, 15909337201, 492190457043, 19216875516479, 939930272232161 (list; graph; listen)

	OFFSET	`1,5`
	EXAMPLE	`Maximal 8 X 8 example` `.0.0.1.1.0.0.0.0` `.0.0.0.1.0.0.0.1` `.1.0.0.1.1.0.1.1` `.1.1.1.0.1.0.1.0` `.0.0.1.1.0.1.1.0` `.0.0.0.0.1.0.0.0` `.0.0.1.1.1.0.0.0` `.0.1.1.0.0.0.0.0`
	CROSSREFS	`Sequence in context: A018044 A047045 A164949 this_sequence A004666 A108488 A018334` `Adjacent sequences: A146658 A146659 A146660 this_sequence A146662 A146663 A146664`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Nov 04 2008`

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Last modified December 19 21:04 EST 2009. Contains 171054 sequences.

AT&T Labs Research