A147422 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 10101-11111 pattern in any orientation.

1, 1, 1, 1, 15, 5, 49, 17, 271, 61, 18529, 4397, 509931, 142159, 26069792

Offset

1,5

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.1.1.0.0.1.1.0
.0.0.1.0.0.1.0.0
.0.1.1.0.0.1.1.0
.0.0.1.0.0.1.0.0
.0.1.1.0.0.1.1.0

Crossrefs

Sequence in context: A166209 A040215 A335879 * A147084 A147361 A147224

Adjacent sequences: A147419 A147420 A147421 * A147423 A147424 A147425

Keyword

nonn

Author

R. H. Hardin

Status

approved