A146587 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0110-1111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 17, 21, 549, 1019, 12531, 32807, 1040313, 3290973, 362333049, 1474237921, 266711200491, 1364122350485, 428284962927597, 2769561073160279, 1886319046954861837, 15405192560843785699, 21883415341502162253677

Offset

1,7

Links

Table of n, a(n) for n=1..23.

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
.0.0.0.0.0.0.0.0
.0.1.0.0.0.0.1.0
.1.1.0.0.0.0.1.1
.1.1.1.0.0.1.1.1
.0.1.0.0.0.0.1.0

Crossrefs

Sequence in context: A147052 A147132 A146840 * A147256 A147163 A147179

Adjacent sequences: A146584 A146585 A146586 * A146588 A146589 A146590

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved