id:A146417 - OEIS Search Results

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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-1000 pattern in any orientation.

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1

1, 1, 1, 1, 1, 1, 1, 1, 4, 7, 14, 21, 51, 123, 453, 1219, 4641, 13599, 63683, 242234, 1440301, 6546459, 44699492, 239296946, 1977082524, 12922743339, 130202512826, 1020385455911, 12242346882334 (list; graph; listen)

	OFFSET	`1,9`
	EXAMPLE	`Maximal 9 X 9 example` `.0.0.0.0.0.1.0.0.0` `.0.0.1.1.1.1.0.0.0` `.0.1.0.0.0.1.0.0.0` `.0.1.0.0.0.0.1.1.1` `.0.1.0.0.0.0.0.1.0` `.1.1.1.0.0.0.0.1.0` `.0.0.0.1.0.0.0.1.0` `.0.0.0.1.1.1.1.0.0` `.0.0.0.1.0.0.0.0.0`
	CROSSREFS	`Sequence in context: A147372 A147440 A146678 this_sequence A008370 A048241 A003404` `Adjacent sequences: A146414 A146415 A146416 this_sequence A146418 A146419 A146420`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net)`

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Last modified December 5 23:38 EST 2009. Contains 170428 sequences.

AT&T Labs Research