A147228 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 11011-01110 pattern in any orientation.

1, 1, 1, 1, 1, 1, 2, 1, 4, 1, 6, 1, 14, 3, 43, 10, 138, 29, 612, 94, 3177, 321, 17102, 1262, 109974, 7231, 884546, 51504

Offset

1,7

Links

Table of n, a(n) for n=1..28.

Example

Maximal 9 X 9 example
.0.0.0.0.0.0.0.0.0
.0.0.1.1.0.1.1.0.0
.0.1.0.1.1.1.0.1.0
.0.1.1.0.0.0.1.1.0
.0.0.1.0.0.0.1.0.0
.0.1.1.0.0.0.1.1.0
.0.1.0.1.1.1.0.1.0
.0.0.1.1.0.1.1.0.0
.0.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A147008 A147365 A147064 * A176729 A300509 A074643

Adjacent sequences: A147225 A147226 A147227 * A147229 A147230 A147231

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved