A146667 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-0111-0110 pattern in any orientation.

1, 1, 1, 1, 1, 1, 17, 31, 603, 1115, 11773, 31193, 660175, 1987061, 224682951, 885526067, 157313783505, 768394153739, 158904168376893, 960773446522435, 410688920693142221, 3062625865459683273

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.0.1.0.0.0.0.1.0
.0.1.1.0.0.1.1.0
.1.1.1.0.0.1.1.1
.1.0.0.0.0.0.0.1
.0.0.1.0.0.1.0.0
.1.1.1.0.0.1.1.1
.1.1.0.0.0.0.1.1
.0.1.0.0.0.0.1.0

Crossrefs

Sequence in context: A045700 A146800 A146731 * A146462 A089171 A279370

Adjacent sequences: A146664 A146665 A146666 * A146668 A146669 A146670

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved