A147225 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 11011-01110 pattern in any orientation.

1, 1, 1, 1, 5, 1, 10, 1, 26, 1, 220, 25, 1696, 141, 21805, 844, 438996, 11391, 9601298, 152742, 309244701, 3160409, 15392335628, 110025582, 1035900361260

Offset

1,5

Links

Table of n, a(n) for n=1..25.

Example

Maximal 9 X 9 example
.0.0.0.1.1.1.0.0.0
.0.0.1.1.0.1.1.0.0
.0.1.0.0.0.0.0.1.0
.1.1.0.0.0.0.0.1.1
.1.0.0.0.0.0.0.0.1
.1.1.0.0.0.0.0.1.1
.0.1.0.0.0.0.0.1.0
.0.0.1.1.0.1.1.0.0
.0.0.0.1.1.1.0.0.0

Crossrefs

Sequence in context: A305838 A329373 A147362 * A147061 A147386 A145759

Adjacent sequences: A147222 A147223 A147224 * A147226 A147227 A147228

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved