A146454 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-0111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 19, 35, 771, 1683, 28615, 78413, 3741521, 13151847, 1946971473, 8940112761, 2361147494637, 13880359808709, 6569185580421057, 49195861314648117, 52900985450007655737, 507372780878036963435

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
.1.1.0.0.0.0.1.1
.0.1.1.0.0.1.1.0
.0.0.1.0.0.1.0.0
.1.0.0.0.0.0.0.1
.1.1.0.0.0.0.1.1
.0.1.1.0.0.1.1.0
.0.1.0.0.0.0.1.0

Crossrefs

Sequence in context: A166055 A333414 A146579 * A186405 A240238 A368833

Adjacent sequences: A146451 A146452 A146453 * A146455 A146456 A146457

Keyword

nonn

Author

R. H. Hardin

Status

approved