A146692 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-1100-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 57, 57, 337, 337, 3641, 3641, 94309, 94309, 2415539, 2415539, 84963203, 84963203

Offset

1,9

Links

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

Example

Maximal 9 X 9 example
.0.1.0.0.0.0.0.1.0
.0.1.0.0.0.0.0.1.0
.0.1.1.1.0.1.1.1.0
.0.0.1.1.0.1.1.0.0
.0.0.0.0.0.0.0.0.0
.0.0.1.1.0.1.1.0.0
.0.1.1.1.0.1.1.1.0
.0.1.0.0.0.0.0.1.0
.0.1.0.0.0.0.0.1.0

Crossrefs

Sequence in context: A146652 A147133 A147164 * A146439 A146785 A146572

Adjacent sequences: A146689 A146690 A146691 * A146693 A146694 A146695

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved