A146412 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1111-0100 pattern in any orientation.

1, 1, 1, 1, 5, 25, 59, 371, 1829, 12351, 114789, 1410427, 19272237, 385707683, 8418983493, 256858401273

Offset

1,5

Links

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

Example

Maximal 8 X 8 example
.0.0.1.1.0.0.1.0
.0.0.0.1.1.0.1.0
.0.0.0.1.0.0.1.1
.0.0.0.1.0.1.1.0
.0.1.1.0.1.0.0.0
.1.1.0.0.1.0.0.0
.0.1.0.1.1.0.0.0
.0.1.0.0.1.1.0.0

Crossrefs

Sequence in context: A146649 A326314 A273357 * A228169 A152734 A080856

Adjacent sequences: A146409 A146410 A146411 * A146413 A146414 A146415

Keyword

nonn

Author

R. H. Hardin

Status

approved