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A147249 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 11100-00100-00111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 13, 13, 41, 41, 245, 245, 1633, 1633, 20989, 20989, 305457, 305457, 6244799, 6244799, 168722653, 168722653 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

Table of n, a(n) for n=1..26.

EXAMPLE

Maximal 11 X 11 example

.0.0.0.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0.0.0.0

.1.1.1.0.0.0.0.0.1.1.1

.0.0.1.0.0.0.0.0.1.0.0

.0.0.1.1.1.0.1.1.1.0.0

.0.0.0.0.0.0.0.0.0.0.0

.0.0.1.1.1.0.1.1.1.0.0

.0.0.1.0.0.0.0.0.1.0.0

.1.1.1.0.0.0.0.0.1.1.1

.0.0.0.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A304268 A214466 A302678 * A321654 A302513 A147013

Adjacent sequences:  A147246 A147247 A147248 * A147250 A147251 A147252

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 24 04:47 EST 2022. Contains 350534 sequences. (Running on oeis4.)