A146588 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0110-1111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 49, 49, 301, 301, 4891, 4891, 104131, 104131, 3555075, 3555075, 179509487, 179509487, 14641599949

Offset

1,9

Links

Table of n, a(n) for n=1..23.

Example

Maximal 9 X 9 example
.0.0.0.0.0.0.0.0.0
.0.0.1.0.0.0.1.0.0
.1.1.1.1.0.1.1.1.1
.0.1.1.0.0.0.1.1.0
.0.0.0.0.0.0.0.0.0
.0.1.1.0.0.0.1.1.0
.1.1.1.1.0.1.1.1.1
.0.0.1.0.0.0.1.0.0
.0.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A146857 A146668 A146732 * A146628 A146636 A146833

Adjacent sequences: A146585 A146586 A146587 * A146589 A146590 A146591

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved