A146069 - OEIS

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A146069

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 5-point zee 1,1 2,1 2,2 2,3 3,3 in any orientation.

1, 1, 1, 1, 1, 1, 9, 21, 35, 101, 287, 859, 3329, 15189, 75035, 399377, 2204921, 14787995, 102936591, 860535039, 7743744003, 81593423043, 911784626279 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,7`
	LINKS	`Table of n, a(n) for n=1..23.`
	EXAMPLE	`Maximal 8 X 8 example` `.1.0.0.0.0.0.1.1` `.1.1.1.0.0.0.1.0` `.0.0.1.0.0.1.1.0` `.0.0.0.0.0.0.0.0` `.0.0.0.0.0.0.0.0` `.0.1.1.0.0.1.0.0` `.0.1.0.0.0.1.1.1` `.1.1.0.0.0.0.0.1`
	CROSSREFS	`Sequence in context: A253052 A043112 A043892 * A140673 A186294 A059993` `Adjacent sequences: A146066 A146067 A146068 * A146070 A146071 A146072`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin, Oct 26 2008`
	STATUS	`approved`

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Last modified May 26 05:25 EDT 2017. Contains 287077 sequences.