A147205 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0101-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 5, 13, 25, 41, 107, 335, 953, 3255, 14559, 66659, 322289, 1582731, 8865325, 55810029

Offset

1,9

Links

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

Example

Maximal 9 X 9 example
.0.0.0.0.0.1.1.0.0
.0.0.0.1.0.1.0.0.0
.0.0.0.1.1.1.0.0.1
.0.1.1.0.0.0.1.1.1
.0.0.1.0.0.0.1.0.0
.1.1.1.0.0.0.1.1.0
.1.0.0.1.1.1.0.0.0
.0.0.0.1.0.1.0.0.0
.0.0.1.1.0.0.0.0.0

Crossrefs

Sequence in context: A268525 A146590 A098483 * A146875 A241233 A064276

Adjacent sequences: A147202 A147203 A147204 * A147206 A147207 A147208

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved