A147383 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 10000-11100-00111-00001 pattern in any orientation.

1, 1, 1, 1, 1, 5, 9, 25, 47, 195, 767, 3745, 18201, 111311, 686767, 6208537, 52616577

Offset

1,6

Links

Table of n, a(n) for n=1..17.

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.1.1
.0.0.0.0.0.0.1.0
.0.0.0.0.0.1.1.0
.0.0.1.1.0.1.0.0
.0.0.1.0.1.1.0.0
.0.1.1.0.0.0.0.0
.0.1.0.0.0.0.0.0
.1.1.0.0.0.0.0.0

Crossrefs

Sequence in context: A284285 A025624 A147496 * A276918 A127976 A147286

Adjacent sequences: A147380 A147381 A147382 * A147384 A147385 A147386

Keyword

nonn

Author

R. H. Hardin

Status

approved