A147427 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 10101-11111 pattern in any orientation.

1, 1, 1, 1, 5, 13, 25, 49, 161, 793, 4845, 27471, 158415, 1126745, 9283892

Offset

1,5

Links

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

Example

Maximal 8 X 8 example
.1.1.0.1.1.1.1.1
.1.0.0.1.0.1.0.1
.1.1.0.0.0.0.0.0
.1.0.0.0.0.0.1.1
.1.1.0.0.0.0.0.1
.0.0.0.0.0.0.1.1
.1.0.1.0.1.0.0.1
.1.1.1.1.1.0.1.1

Crossrefs

Sequence in context: A147265 A272705 A147272 * A147408 A241657 A249513

Adjacent sequences: A147424 A147425 A147426 * A147428 A147429 A147430

Keyword

nonn

Author

R. H. Hardin

Status

approved