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A147270 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1000-1111-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 183, 351, 3185, 7397, 80251, 204181, 3751343, 10958987, 859595115, 3088432553, 597934255811, 2680671785861 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.1.0.1.0.0.0

.1.1.1.1.0.1.1.1.1

.1.0.0.0.0.0.0.0.1

.1.0.0.0.0.0.0.0.1

.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

.0.0.0.1.0.1.0.0.0

CROSSREFS

Sequence in context: A133609 A305349 A030465 * A147124 A261110 A260172

Adjacent sequences:  A147267 A147268 A147269 * A147271 A147272 A147273

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified June 20 10:13 EDT 2019. Contains 324234 sequences. (Running on oeis4.)