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A147124 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1000-1111-1000 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 183, 351, 3263, 7493, 94421, 245945, 5221197, 15740513, 1251933355, 4637231205, 678331261037, 3060437240807, 522754227927889 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.1.0.1.0.0.0

.1.1.1.1.0.1.1.1.1

.0.0.0.1.0.1.0.0.0

.0.0.0.1.0.1.0.0.0

.0.0.0.0.0.0.0.0.0

.1.0.0.0.0.0.0.0.1

.1.0.0.0.0.0.0.0.1

.1.1.1.1.0.1.1.1.1

.1.0.0.0.0.0.0.0.1

CROSSREFS

Sequence in context: A305349 A030465 A147270 * A261110 A260172 A252070

Adjacent sequences:  A147121 A147122 A147123 * A147125 A147126 A147127

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 21 14:16 EDT 2019. Contains 328301 sequences. (Running on oeis4.)