A147465 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111-0011 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 7, 19, 33, 57, 137, 389, 1061, 3337, 12013, 46721, 194071, 871607, 4080549, 21286795, 118904521, 740082723, 4935470201, 36634269329

Offset

1,8

Links

Table of n, a(n) for n=1..25.

Example

Maximal 8 X 8 example
.0.0.0.0.0.1.1.0
.1.1.0.1.1.1.1.0
.1.1.0.1.1.0.0.0
.0.1.1.0.0.1.1.0
.0.1.1.0.0.1.1.0
.0.0.0.1.1.0.1.1
.0.1.1.1.1.0.1.1
.0.1.1.0.0.0.0.0

Crossrefs

Sequence in context: A338410 A038869 A147503 * A053591 A165333 A154878

Adjacent sequences: A147462 A147463 A147464 * A147466 A147467 A147468

Keyword

nonn

Author

R. H. Hardin

Status

approved