A147419 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1001-1111-0110 pattern in any orientation.

1, 1, 1, 1, 1, 1, 3, 8, 17, 36, 53, 124, 323, 1007, 2889, 11702, 39960, 173688, 672545, 3448944, 15619066, 95906062, 522271313, 3756284779, 24152062634

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.1.1.0.0.1.0.0.1
.0.1.1.0.1.1.1.1
.0.1.1.0.0.1.1.0
.1.1.0.0.0.0.0.0
.0.0.0.0.0.0.1.1
.0.1.1.0.0.1.1.0
.1.1.1.1.0.1.1.0
.1.0.0.1.0.0.1.1

Crossrefs

Sequence in context: A052996 A112523 A369734 * A106691 A140176 A238496

Adjacent sequences: A147416 A147417 A147418 * A147420 A147421 A147422

Keyword

nonn

Author

R. H. Hardin

Status

approved