A146455 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 57, 57, 533, 533, 9707, 9707, 296859, 296859, 11801387, 11801387, 824137549, 824137549, 100677999633, 100677999633

Offset

1,9

Links

Table of n, a(n) for n=1..24.

Example

Maximal 9 X 9 example
.0.0.0.0.0.0.0.0.0
.0.0.1.0.0.0.1.0.0
.0.1.1.1.0.1.1.1.0
.1.1.0.0.0.0.0.1.1
.0.0.0.0.0.0.0.0.0
.1.1.0.0.0.0.0.1.1
.0.1.1.1.0.1.1.1.0
.0.0.1.0.0.0.1.0.0
.0.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A147211 A147241 A146580 * A146048 A146809 A147233

Adjacent sequences: A146452 A146453 A146454 * A146456 A146457 A146458

Keyword

nonn

Author

R. H. Hardin

Status

approved