A146379 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-1111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 3, 13, 25, 41, 95, 289, 1010, 4113, 15296, 63783, 305771, 1708813, 10377230, 69118879, 490255119, 4001984029, 36100718210, 369478821921, 4060660472495, 50042558173907

Offset

1,7

Links

Table of n, a(n) for n=1..26.

Example

Maximal 8 X 8 example
.0.0.0.1.0.0.0.0
.0.0.1.1.1.1.0.0
.0.1.0.1.0.0.1.0
.0.1.0.0.0.1.1.1
.1.1.1.0.0.0.1.0
.0.1.0.0.1.0.1.0
.0.0.1.1.1.1.0.0
.0.0.0.0.1.0.0.0

Crossrefs

Sequence in context: A144826 A030552 A146371 * A056714 A120074 A056706

Adjacent sequences: A146376 A146377 A146378 * A146380 A146381 A146382

Keyword

nonn

Author

R. H. Hardin

Status

approved