A147512 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 11110-01111 pattern in any orientation.

1, 1, 1, 1, 5, 9, 25, 59, 279, 1153, 8111, 46003, 371173, 2930355, 33533835, 383283501

Offset

1,5

Links

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

Example

Maximal 8 X 8 example
.1.1.1.1.0.0.0.1
.0.1.1.1.1.0.1.1
.0.0.0.0.0.0.1.1
.0.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.0
.1.1.0.0.0.0.0.0
.1.1.0.1.1.1.1.0
.1.0.0.0.1.1.1.1

Crossrefs

Sequence in context: A147286 A137199 A221567 * A301960 A050359 A062812

Adjacent sequences: A147509 A147510 A147511 * A147513 A147514 A147515

Keyword

nonn

Author

R. H. Hardin

Status

approved