A147496 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 11101-10111 pattern in any orientation.

1, 1, 1, 1, 5, 9, 25, 45, 145, 605, 4313, 20593, 130161, 816717, 6861977, 63223597, 879585069, 10212102803

Offset

1,5

Links

Table of n, a(n) for n=1..18.

Example

Maximal 8 X 8 example
.1.1.0.1.1.1.0.1
.1.0.0.1.0.1.1.1
.1.1.0.0.0.0.0.0
.0.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.0
.0.0.0.0.0.0.1.1
.1.1.1.0.1.0.0.1
.1.0.1.1.1.0.1.1

Crossrefs

Sequence in context: A259665 A284285 A025624 * A147383 A276918 A127976

Adjacent sequences: A147493 A147494 A147495 * A147497 A147498 A147499

Keyword

nonn

Author

R. H. Hardin

Status

approved