A147415 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1001-1111-0110 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 6, 9, 32, 25, 194, 81, 1875, 559, 19586

Offset

1,8

Links

Table of n, a(n) for n=1..16.

Example

Maximal 8 X 8 example
.0.0.1.0.0.1.0.0
.0.0.1.1.1.1.0.0
.1.1.0.1.1.0.1.1
.0.1.1.0.0.1.1.0
.0.1.1.0.0.1.1.0
.1.1.0.1.1.0.1.1
.0.0.1.1.1.1.0.0
.0.0.1.0.0.1.0.0

Crossrefs

Sequence in context: A180325 A192425 A219687 * A217048 A105866 A267690

Adjacent sequences: A147412 A147413 A147414 * A147416 A147417 A147418

Keyword

nonn

Author

R. H. Hardin

Status

approved