id:A147216 - 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 1100-0111-0011 pattern in any orientation.

+0
1

1, 1, 1, 1, 5, 21, 61, 299, 1693, 11273, 84165, 889613, 11762051, 208288599, 4127254537, 109970171123 (list; graph; listen)

	OFFSET	`1,5`
	EXAMPLE	`Maximal 8 X 8 example` `.0.0.0.0.0.1.1.0` `.0.0.0.1.1.1.0.1` `.0.0.0.1.1.0.1.1` `.0.1.1.0.0.1.1.0` `.0.1.1.0.0.1.1.0` `.1.1.0.1.1.0.0.0` `.1.0.1.1.1.0.0.0` `.0.1.1.0.0.0.0.0`
	CROSSREFS	`Sequence in context: A112561 A143567 A147375 this_sequence A146822 A146223 A055384` `Adjacent sequences: A147213 A147214 A147215 this_sequence A147217 A147218 A147219`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Nov 04 2008`

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