A146452 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0110-0011 pattern in any orientation.

1, 1, 1, 1, 5, 13, 37, 161, 805, 4895, 32839, 307077, 3448973, 48418161, 832120215, 18174765257

Offset

1,5

Links

Table of n, a(n) for n=1..16.

Example

Maximal 8 X 8 example
.0.0.1.0.0.1.1.0
.0.1.1.0.1.1.0.1
.1.1.0.1.1.0.1.1
.1.0.1.0.0.1.1.0
.0.1.1.0.0.1.0.1
.1.1.0.1.1.0.1.1
.1.0.1.1.0.1.1.0
.0.1.1.0.0.1.0.0

Crossrefs

Sequence in context: A199108 A125734 A146925 * A146062 A201612 A129924

Adjacent sequences: A146449 A146450 A146451 * A146453 A146454 A146455

Keyword

nonn

Author

R. H. Hardin

Status

approved