A147462 - OEIS

A147462

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-1111-0011 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 25, 25, 93, 93, 589, 589, 6735, 6735, 107293, 107293, 1848191, 1848191, 45715541, 45715541, 1702371353, 1702371353

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OFFSET

1,9

LINKS

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

EXAMPLE

Maximal 9 X 9 example

.0.0.1.1.0.1.1.0.0

.0.1.1.0.0.0.1.1.0

.0.0.0.0.0.0.0.0.0

.0.1.1.0.0.0.1.1.0

.0.0.1.1.0.1.1.0.0

CROSSREFS

Sequence in context: A146591 A146868 A147430 * A146367 A014725 A202208

Adjacent sequences: A147459 A147460 A147461 * A147463 A147464 A147465

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved