A147114 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1000-1111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 5, 25, 81, 473, 2129, 11977, 83125, 759723, 8281919, 118112177, 1957920765

Offset

1,6

Links

Table of n, a(n) for n=1..16.

Example

Maximal 8 X 8 example
.0.0.0.0.0.1.0.0
.1.1.1.0.1.1.1.1
.0.0.1.0.0.0.0.1
.0.0.1.1.0.1.0.1
.1.0.1.0.1.1.0.0
.1.0.0.0.0.1.0.0
.1.1.1.1.0.1.1.1
.0.0.1.0.0.0.0.0

Crossrefs

Sequence in context: A122679 A264132 A355949 * A296669 A131537 A250555

Adjacent sequences: A147111 A147112 A147113 * A147115 A147116 A147117

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved