A146230 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111 pattern in any orientation.

1, 1, 1, 1, 1, 3, 13, 33, 61, 183, 597, 2481, 11129, 55369, 260691, 1725489, 11211005, 97261999, 792491905, 8327148961, 84267555083, 1143224998469

Offset

1,6

Links

Table of n, a(n) for n=1..22.

Example

Maximal 8 X 8 example
.0.0.0.0.1.1.0.0
.0.0.0.0.1.1.0.0
.1.1.1.1.0.1.0.0
.1.1.0.0.0.1.0.0
.0.0.1.0.0.0.1.1
.0.0.1.0.1.1.1.1
.0.0.1.1.0.0.0.0
.0.0.1.1.0.0.0.0

Crossrefs

Sequence in context: A168375 A032586 A147137 * A166805 A252979 A332366

Adjacent sequences: A146227 A146228 A146229 * A146231 A146232 A146233

Keyword

nonn

Author

R. H. Hardin

Status

approved