id:A146047 - OEIS Search Results

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

+0
1

1, 1, 1, 1, 13, 19, 471, 1011, 17363, 51133, 4227773, 17426251, 4189737457, 23548416611, 8347118368027, 61971666176727, 58964882823496375, 583865226098623749, 1588500435723596374221, 21184137467738936180415 (list; graph; listen)

	OFFSET	`1,5`
	EXAMPLE	`Maximal 8 X 8 example` `.1.1.0.0.0.0.1.1` `.1.1.0.0.0.0.1.1` `.1.0.0.0.0.0.0.1` `.0.1.1.0.0.1.1.0` `.0.1.1.0.0.1.1.0` `.0.0.1.0.0.1.0.0` `.1.1.0.0.0.0.1.1` `.1.1.1.0.0.1.1.1`
	CROSSREFS	`Sequence in context: A166664 A147393 A088187 this_sequence A145944 A095040 A069195` `Adjacent sequences: A146044 A146045 A146046 this_sequence A146048 A146049 A146050`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 26 2008`

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

AT&T Labs Research