A147081 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 10000-11111-10000 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 5, 11, 23, 38, 81, 220, 567, 1681, 5209, 18445, 63999, 259065, 1109285, 5269124, 26433601, 148185912, 862407722

Offset

1,8

Links

Table of n, a(n) for n=1..24.

Example

Maximal 8 X 8 example
.0.0.0.0.1.0.1.0
.1.1.1.1.1.0.1.0
.0.0.0.0.1.0.1.0
.1.1.1.0.0.0.1.0
.0.1.0.0.0.1.1.1
.0.1.0.1.0.0.0.0
.0.1.0.1.1.1.1.1
.0.1.0.1.0.0.0.0

Crossrefs

Sequence in context: A190148 A281875 A143125 * A046628 A262284 A118439

Adjacent sequences: A147078 A147079 A147080 * A147082 A147083 A147084

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved