A147192 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 11000-01110-00011 pattern in any orientation.

1, 1, 1, 1, 5, 9, 25, 39, 213, 729, 5371, 22321, 227621, 1304481, 19507517, 156958957

Offset

1,5

Links

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

Example

Maximal 8 X 8 example
.0.0.1.0.0.0.1.1
.0.1.1.0.1.1.1.0
.0.1.0.1.1.0.0.0
.1.1.0.0.0.0.0.1
.1.0.0.0.0.0.1.1
.0.0.0.1.1.0.1.0
.0.1.1.1.0.1.1.0
.1.1.0.0.0.1.0.0

Crossrefs

Sequence in context: A273827 A024825 A147074 * A259665 A284285 A025624

Adjacent sequences: A147189 A147190 A147191 * A147193 A147194 A147195

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved