id:A147480 - 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 1100-1111-1100 pattern in any orientation.

+0
1

1, 1, 1, 1, 1, 9, 21, 73, 310, 1107, 5232, 33319, 240772, 2106289, 21011261, 262231181, 3633528079, 62517538899 (list; graph; listen)

	OFFSET	`1,6`
	EXAMPLE	`Maximal 8 X 8 example` `.0.0.1.1.0.0.0.0` `.1.1.1.1.0.0.0.0` `.0.0.1.1.0.0.1.1` `.1.1.0.0.1.1.1.1` `.1.1.1.1.0.0.1.1` `.1.1.0.0.1.1.0.0` `.0.0.0.0.1.1.1.1` `.0.0.0.0.1.1.0.0`
	CROSSREFS	`Sequence in context: A147466 A137340 A075640 this_sequence A146396 A146681 A050860` `Adjacent sequences: A147477 A147478 A147479 this_sequence A147481 A147482 A147483`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net)`

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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.