A146596 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1000-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 77, 77, 549, 549, 6061, 6061, 126381, 126381, 3867721, 3867721, 164716773, 164716773

Offset

1,9

Links

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

Example

Maximal 9 X 9 example
.0.0.0.0.0.0.0.0.0
.1.0.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.0.1
.1.1.1.1.0.1.1.1.1
.0.0.0.0.0.0.0.0.0
.1.1.1.1.0.1.1.1.1
.1.0.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.0.1
.0.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A146817 A146660 A070852 * A146391 A145945 A165838

Adjacent sequences: A146593 A146594 A146595 * A146597 A146598 A146599

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved