A146782 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0010-1010-1111 pattern in any orientation.

1, 1, 1, 1, 1, 13, 49, 239, 1173, 4715, 31587, 301011, 3297233, 42878373, 733059585, 14504194097

Offset

1,6

Links

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

Example

Maximal 8 X 8 example
.1.1.1.1.0.0.0.0
.1.0.1.0.0.0.1.1
.0.0.1.0.0.0.0.1
.1.0.0.0.0.1.1.1
.1.1.1.0.0.0.0.1
.1.0.0.0.0.1.0.0
.1.1.0.0.0.1.0.1
.0.0.0.0.1.1.1.1

Crossrefs

Sequence in context: A289999 A147346 A147452 * A320469 A074014 A147481

Adjacent sequences: A146779 A146780 A146781 * A146783 A146784 A146785

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved