A146471 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1110-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 13, 13, 69, 69, 457, 457, 6223, 6223, 127787, 127787, 3658281, 3658281, 163817453, 163817453, 11238713859, 11238713859, 1160267254915, 1160267254915

Offset

1,9

Links

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

Example

Maximal 9 X 9 example
.0.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0.0
.0.1.1.1.0.1.1.1.0
.1.1.1.0.0.0.1.1.1
.0.0.0.0.0.0.0.0.0
.1.1.1.0.0.0.1.1.1
.0.1.1.1.0.1.1.1.0
.0.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A147187 A147069 A303312 * A071612 A059796 A214468

Adjacent sequences: A146468 A146469 A146470 * A146472 A146473 A146474

Keyword

nonn

Author

R. H. Hardin

Status

approved