A147195 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0100-0111-0001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 17, 17, 45, 45, 217, 217, 1805, 1805, 29665, 29665, 431133, 431133, 7762019, 7762019, 212346129, 212346129

Offset

1,9

Links

Table of n, a(n) for n=1..26.

Example

Maximal 9 X 9 example
.0.0.1.1.0.1.1.0.0
.0.0.1.0.0.0.1.0.0
.1.1.1.0.0.0.1.1.1
.1.0.0.0.0.0.0.0.1
.0.0.0.0.0.0.0.0.0
.1.0.0.0.0.0.0.0.1
.1.1.1.0.0.0.1.1.1
.0.0.1.0.0.0.1.0.0
.0.0.1.1.0.1.1.0.0

Crossrefs

Sequence in context: A146860 A146185 A147399 * A147045 A146065 A146242

Adjacent sequences: A147192 A147193 A147194 * A147196 A147197 A147198

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved