A147324 Number of n X n binary arrays symmetric under 180 degree rotation with all 1's connected only in a 00100-00100-00100-11111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 5, 15, 54, 179, 629, 2109, 10035, 48099

Offset

1,7

Links

Table of n, a(n) for n=1..14.

Example

Maximal 8 X 8 example
.1.1.1.1.1.0.0.1
.0.0.1.0.0.0.0.1
.0.0.1.0.1.1.1.1
.1.0.1.0.0.0.0.1
.1.0.0.0.0.1.0.1
.1.1.1.1.0.1.0.0
.1.0.0.0.0.1.0.0
.1.0.0.1.1.1.1.1

Crossrefs

Sequence in context: A149582 A149583 A149584 * A109245 A243076 A002221

Adjacent sequences: A147321 A147322 A147323 * A147325 A147326 A147327

Keyword

nonn

Author

R. H. Hardin

Status

approved