A146865 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1101-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 25, 25, 193, 193, 1061, 1061, 19265, 19265, 384413, 384413, 13738057, 13738057, 820631045, 820631045

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
.0.0.0.0.0.0.0.0.0
.1.1.0.1.0.1.0.1.1
.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
.1.1.0.1.0.1.0.1.1
.0.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A022359 A147491 A147507 * A146740 A146724 A165846

Adjacent sequences: A146862 A146863 A146864 * A146866 A146867 A146868

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved