id:A145944 - OEIS Search Results

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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected in a 3X2 elbow 1,1 1,2 1,3 2,3 in any orientation.

+0
1

1, 1, 1, 1, 13, 19, 595, 1473, 41647, 139371, 13954303, 64086157, 18839470495, 119460750005, 78516712094765, 679135834059151, 1132864641733411477, 13390989972487068017, 60598468634533341708705, 981938713996881194950713 (list; graph; listen)

	OFFSET	`1,5`
	EXAMPLE	`Maximal 8 X 8 example` `.1.1.1.0.0.1.1.1` `.1.0.0.0.0.0.0.1` `.0.1.1.0.0.1.1.0` `.1.0.1.0.0.1.0.1` `.1.0.1.0.0.1.0.1` `.1.1.0.0.0.0.1.1` `.0.0.1.0.0.1.0.0` `.1.1.1.0.0.1.1.1`
	CROSSREFS	`Sequence in context: A147393 A088187 A146047 this_sequence A095040 A069195 A098956` `Adjacent sequences: A145941 A145942 A145943 this_sequence A145945 A145946 A145947`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 25 2008`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

AT&T Labs Research