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A146367 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 25, 25, 125, 125, 1323, 1323, 18755, 18755, 388143, 388143, 11998517, 11998517, 573092271, 573092271, 41661958269, 41661958269, 4471274578309, 4471274578309, 730746269407465 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..29.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.0.0.0

.0.0.1.0.0.0.1.0.0

.1.1.1.1.0.1.1.1.1

.0.1.0.0.0.0.0.1.0

.0.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.0.1.0

.1.1.1.1.0.1.1.1.1

.0.0.1.0.0.0.1.0.0

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A146868 A147430 A147462 * A014725 A202208 A059816

Adjacent sequences:  A146364 A146365 A146366 * A146368 A146369 A146370

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified September 20 22:20 EDT 2021. Contains 347596 sequences. (Running on oeis4.)