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.

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

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