A146628 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1010-1111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 49, 49, 309, 309, 4157, 4157, 84741, 84741, 2465029, 2465029, 97708135, 97708135

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
.0.0.1.0.0.0.1.0.0
.1.1.1.1.0.1.1.1.1
.1.0.1.0.0.0.1.0.1
.0.0.0.0.0.0.0.0.0
.1.0.1.0.0.0.1.0.1
.1.1.1.1.0.1.1.1.1
.0.0.1.0.0.0.1.0.0
.0.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A146668 A146732 A146588 * A146636 A146833 A146700

Adjacent sequences: A146625 A146626 A146627 * A146629 A146630 A146631

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved