A146391 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1100-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 85, 85, 693, 693, 9501, 9501, 265597, 265597, 10400895, 10400895, 596407005, 596407005

Offset

1,9

Links

Table of n, a(n) for n=1..22.

Example

Maximal 9 X 9 example
.0.1.1.0.0.0.1.1.0
.1.1.0.0.0.0.0.1.1
.1.0.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.0.1
.0.0.0.0.0.0.0.0.0
.1.0.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.0.1
.1.1.0.0.0.0.0.1.1
.0.1.1.0.0.0.1.1.0

Crossrefs

Sequence in context: A146660 A070852 A146596 * A145945 A165838 A217543

Adjacent sequences: A146388 A146389 A146390 * A146392 A146393 A146394

Keyword

nonn

Author

R. H. Hardin

Status

approved