A146617 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1111-0110 pattern in any orientation.

1, 1, 1, 1, 5, 21, 57, 285, 1551, 8309, 69683, 754867, 9884801, 158671845, 3311072917, 81046423259

Offset

1,5

Links

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

Example

Maximal 8 X 8 example
.0.1.0.0.1.1.0.0
.1.1.0.1.1.0.0.0
.1.1.0.1.1.0.0.0
.0.1.1.0.1.0.0.0
.0.0.0.1.0.1.1.0
.0.0.0.1.1.0.1.1
.0.0.0.1.1.0.1.1
.0.0.1.1.0.0.1.0

Crossrefs

Sequence in context: A033275 A166464 A059859 * A245240 A370839 A203233

Adjacent sequences: A146614 A146615 A146616 * A146618 A146619 A146620

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved