A146793 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0110-0100-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 49, 49, 129, 129, 2513, 2513, 72929, 72929, 1541697, 1541697, 32044977, 32044977

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
.0.1.1.0.0.0.1.1.0
.0.0.1.0.0.0.1.0.0
.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
.0.0.1.0.0.0.1.0.0
.0.1.1.0.0.0.1.1.0
.0.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A040273 A022351 A146873 * A146801 A147203 A146777

Adjacent sequences: A146790 A146791 A146792 * A146794 A146795 A146796

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved