A147179 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1111-0101 pattern in any orientation.

1, 1, 1, 1, 1, 1, 17, 21, 565, 1145, 12479, 31399, 640435, 1895643, 107049481, 386487735, 48463219765, 218714170211, 47470279346001, 263294969585091, 82919443144541165, 560855115342510007

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.1.1.0.0.1.1.0
.0.1.0.0.0.0.1.0
.0.1.1.0.0.1.1.0
.1.1.0.0.0.0.1.1

Crossrefs

Sequence in context: A146587 A147256 A147163 * A146627 A146635 A146832

Adjacent sequences: A147176 A147177 A147178 * A147180 A147181 A147182

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved