A146601 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1000-1111 pattern in any orientation.

1, 1, 1, 1, 9, 17, 69, 301, 1753, 10173, 84391, 728377, 10351543, 132350331, 2998203817

Offset

1,5

Links

Table of n, a(n) for n=1..15.

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.1
.1.0.0.0.1.1.1.1
.1.1.1.1.0.0.0.0
.0.0.0.0.1.1.1.1
.1.1.1.1.0.0.0.1
.1.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A282764 A319018 A101304 * A121955 A151793 A118852

Adjacent sequences: A146598 A146599 A146600 * A146602 A146603 A146604

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved