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A147330 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 00100-00100-11111-00100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 6, 13, 32, 43, 80, 143, 550, 1371, 5869, 15663, 62826, 179478, 939656, 3406007, 21134246, 88331414, 597297267 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

Maximal 9 X 9 example

.0.0.1.0.0.0.0.1.0

.1.1.1.1.1.0.0.1.0

.0.0.1.0.0.1.1.1.1

.0.0.1.0.0.0.0.1.0

.0.1.0.0.0.0.0.1.0

.0.1.0.0.0.0.1.0.0

.1.1.1.1.0.0.1.0.0

.0.1.0.0.1.1.1.1.1

.0.1.0.0.0.0.1.0.0

CROSSREFS

Sequence in context: A256871 A192304 A343544 * A042607 A048693 A041068

Adjacent sequences:  A147327 A147328 A147329 * A147331 A147332 A147333

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified July 28 23:26 EDT 2021. Contains 346340 sequences. (Running on oeis4.)