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A147327 Number of n X n binary arrays symmetric under horizontal and vertical reflection 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, 1, 28, 9, 150, 25, 1118, 57, 7823, 349, 97756, 3222, 1845246, 35623, 42655192, 520596, 1288627017, 9629183 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

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

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.1.0.0.0.0

.0.0.1.1.1.1.1.0.0

.0.1.0.0.1.0.0.1.0

.0.1.0.0.1.0.0.1.0

.1.1.1.1.0.1.1.1.1

.0.1.0.0.1.0.0.1.0

.0.1.0.0.1.0.0.1.0

.0.0.1.1.1.1.1.0.0

.0.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A281631 A259230 A278756 * A145629 A193633 A176289

Adjacent sequences:  A147324 A147325 A147326 * A147328 A147329 A147330

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified September 20 07:22 EDT 2021. Contains 347577 sequences. (Running on oeis4.)