A147018 - OEIS

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A147018

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 01000-11111-00010 pattern in any orientation.

1, 1, 1, 1, 5, 9, 21, 35, 177, 589, 4235, 15969, 164553, 879607, 12456629, 97189937, 1947709409, 20669429409 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,5`
	LINKS	`Table of n, a(n) for n=1..18.`
	EXAMPLE	`Maximal 8 X 8 example` `.0.1.0.0.0.0.1.0` `.1.1.0.1.1.1.1.1` `.0.1.0.0.1.0.0.0` `.0.1.1.0.0.0.1.0` `.0.1.0.0.0.1.1.0` `.0.0.0.1.0.0.1.0` `.1.1.1.1.1.0.1.1` `.0.1.0.0.0.0.1.0`
	CROSSREFS	`Sequence in context: A068481 A146827 A216414 * A081883 A049744 A000323` `Adjacent sequences: A147015 A147016 A147017 * A147019 A147020 A147021`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin, Nov 04 2008`
	STATUS	`approved`

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Last modified March 7 04:34 EST 2014. Contains 238504 sequences.