A146577 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0100-0100-1111 pattern in any orientation.

1, 1, 1, 1, 5, 17, 71, 385, 1763, 10689, 97117, 1072429, 14923393, 247249411, 5297126647, 138340878961

Offset

1,5

Links

Table of n, a(n) for n=1..16.

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.1.0
.0.1.0.0.0.0.1.0
.0.1.0.0.1.1.1.1
.1.1.1.1.0.0.0.0
.0.0.0.0.1.1.1.1
.1.1.1.1.0.0.1.0
.0.1.0.0.0.0.1.0
.0.1.0.0.0.0.0.0

Crossrefs

Sequence in context: A149715 A149716 A324800 * A211405 A354040 A187823

Adjacent sequences: A146574 A146575 A146576 * A146578 A146579 A146580

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved