A147365 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 01110-11111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 2, 1, 4, 1, 6, 1, 14, 3, 43, 10, 133, 29, 589, 94, 2990, 317, 15789, 1198, 99524, 6765, 770619

Offset

1,7

Links

Table of n, a(n) for n=1..27.

Example

Maximal 9 X 9 example
.0.0.0.0.0.0.0.0.0
.0.0.1.1.1.1.1.0.0
.0.1.0.1.1.1.0.1.0
.0.1.1.0.0.0.1.1.0
.0.1.1.0.0.0.1.1.0
.0.1.1.0.0.0.1.1.0
.0.1.0.1.1.1.0.1.0
.0.0.1.1.1.1.1.0.0
.0.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A239871 A147389 A147008 * A147064 A147228 A176729

Adjacent sequences: A147362 A147363 A147364 * A147366 A147367 A147368

Keyword

nonn

Author

R. H. Hardin

Status

approved