A147010 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 00100-11111-00100 pattern in any orientation.

1, 1, 1, 1, 3, 5, 9, 19, 56, 167, 758, 2457, 14728, 66625, 526225, 3298653, 34425031, 276512141, 3848586911, 41626261490

Offset

1,5

Links

Table of n, a(n) for n=1..20.

Example

Maximal 8 X 8 example
.0.1.0.0.0.1.0.0
.0.1.0.1.1.1.1.1
.1.1.1.0.0.1.0.0
.0.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.0
.0.0.1.0.0.1.1.1
.1.1.1.1.1.0.1.0
.0.0.1.0.0.0.1.0

Crossrefs

Sequence in context: A192480 A107028 A147470 * A146912 A146940 A146251

Adjacent sequences: A147007 A147008 A147009 * A147011 A147012 A147013

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved