A147265 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1100-0111-0001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 5, 13, 25, 47, 157, 479, 1191, 4193, 22021, 114523, 544473, 2865365, 19090211, 131534115

Offset

1,9

Links

Table of n, a(n) for n=1..22.

Example

Maximal 9 X 9 example
.0.0.0.0.0.0.1.0.0
.0.0.0.0.1.1.1.0.0
.0.0.0.1.1.0.0.1.1
.0.0.1.0.1.0.0.1.0
.0.1.1.1.0.1.1.1.0
.0.1.0.0.1.0.1.0.0
.1.1.0.0.1.1.0.0.0
.0.0.1.1.1.0.0.0.0
.0.0.1.0.0.0.0.0.0

Crossrefs

Sequence in context: A146260 A147166 A146192 * A272705 A147272 A147427

Adjacent sequences: A147262 A147263 A147264 * A147266 A147267 A147268

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved