A147065 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 01010-11111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 4, 7, 20, 27, 84, 153, 692, 1605, 7549, 19036, 103045, 315223, 2201412, 8341738, 68161042, 299153867, 2851751081, 14915115066

Offset

1,7

Links

Table of n, a(n) for n=1..24.

Example

Maximal 8 X 8 example
.0.1.0.0.1.0.1.0
.1.1.0.1.1.1.1.1
.0.1.0.0.0.0.0.0
.1.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.1
.0.0.0.0.0.0.1.0
.1.1.1.1.1.0.1.1
.0.1.0.1.0.0.1.0

Crossrefs

Sequence in context: A359733 A090879 A084404 * A049947 A266822 A296624

Adjacent sequences: A147062 A147063 A147064 * A147066 A147067 A147068

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved