A147426 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 10101-11111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 5, 15, 25, 53, 121, 291, 811, 2486

Offset

1,8

Links

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

Example

Maximal 8 X 8 example
.1.0.1.0.1.0.1.1
.1.1.1.1.1.0.1.0
.0.0.0.0.0.0.1.1
.1.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.1
.1.1.0.0.0.0.0.0
.0.1.0.1.1.1.1.1
.1.1.0.1.0.1.0.1

Crossrefs

Sequence in context: A229312 A197072 A147495 * A100437 A339567 A067533

Adjacent sequences: A147423 A147424 A147425 * A147427 A147428 A147429

Keyword

nonn

Author

R. H. Hardin

Status

approved