A146777 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0010-1010-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 49, 49, 205, 205, 3001, 3001, 66003, 66003, 1489297, 1489297, 39955495, 39955495

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
.0.1.0.0.0.0.0.1.0
.0.1.0.1.0.1.0.1.0
.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
.0.1.0.1.0.1.0.1.0
.0.1.0.0.0.0.0.1.0
.0.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A146793 A146801 A147203 * A147053 A146857 A146668

Adjacent sequences: A146774 A146775 A146776 * A146778 A146779 A146780

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved