A146411 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 7, 21, 45, 89, 233, 863, 3251, 15437, 73625, 393971, 2328247, 15894743, 120359659, 1040197243, 9831811849, 105976019467

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.0.1.1.0
.1.0.0.0.1.1.0.0
.1.1.1.1.0.1.0.0
.0.1.0.0.0.1.0.0
.0.0.1.0.0.0.1.0
.0.0.1.0.1.1.1.1
.0.0.1.1.0.0.0.1
.0.1.1.0.0.0.0.0

Crossrefs

Sequence in context: A246430 A256051 A299254 * A287431 A127736 A212677

Adjacent sequences: A146408 A146409 A146410 * A146412 A146413 A146414

Keyword

nonn

Author

R. H. Hardin

Status

approved