A147064 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 01010-11111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 2, 1, 4, 1, 6, 1, 14, 3, 43, 10, 133, 29, 604, 96, 3118, 333, 17061, 1304, 110347, 7679, 888486, 55914

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
.0.0.1.1.1.1.1.0.0
.0.1.0.1.0.1.0.1.0
.0.1.1.0.0.0.1.1.0
.0.1.0.0.0.0.0.1.0
.0.1.1.0.0.0.1.1.0
.0.1.0.1.0.1.0.1.0
.0.0.1.1.1.1.1.0.0
.0.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A147389 A147008 A147365 * A147228 A176729 A300509

Adjacent sequences: A147061 A147062 A147063 * A147065 A147066 A147067

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved