A147369 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0111-1100-0111 pattern in any orientation.

1, 1, 1, 1, 5, 1, 19, 13, 300, 253, 9196, 2685, 408268, 46561, 21554860

Offset

1,5

Links

Table of n, a(n) for n=1..15.

Example

Maximal 8 X 8 example
.1.0.1.0.0.1.0.1
.1.0.1.0.0.1.0.1
.1.1.1.0.0.1.1.1
.0.1.0.0.0.0.1.0
.1.0.1.0.0.1.0.1
.1.0.1.0.0.1.0.1
.1.1.1.0.0.1.1.1
.0.1.0.0.0.0.1.0

Crossrefs

Sequence in context: A146055 A286232 A147437 * A375363 A066480 A136394

Adjacent sequences: A147366 A147367 A147368 * A147370 A147371 A147372

Keyword

nonn

Author

R. H. Hardin

Status

approved