A147366 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 01110-11111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 4, 7, 18, 27, 60, 127, 520, 1313, 5577, 14738, 65753, 214371, 1292619, 5259696, 36901354, 169889413, 1338225681, 7299428688

Offset

1,7

Links

Table of n, a(n) for n=1..24.

Example

Maximal 8 X 8 example
.0.1.0.0.1.1.1.0
.1.1.0.1.1.1.1.1
.1.1.0.0.0.0.0.0
.1.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.1
.0.0.0.0.0.0.1.1
.1.1.1.1.1.0.1.1
.0.1.1.1.0.0.1.0

Crossrefs

Sequence in context: A357041 A318025 A005509 * A056318 A011948 A256216

Adjacent sequences: A147363 A147364 A147365 * A147367 A147368 A147369

Keyword

nonn

Author

R. H. Hardin

Status

approved