A146729 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1101-0111 pattern in any orientation.

1, 1, 1, 1, 17, 35, 131, 817, 4781, 41379, 493009, 5930505, 104085935, 2108933179

Offset

1,5

Links

Table of n, a(n) for n=1..14.

Example

Maximal 8 X 8 example
.1.0.1.1.0.1.1.1
.1.1.1.0.1.1.0.1
.0.0.0.0.0.0.0.0
.1.0.1.1.0.1.1.1
.1.1.1.0.1.1.0.1
.0.0.0.0.0.0.0.0
.1.0.1.1.0.1.1.1
.1.1.1.0.1.1.0.1

Crossrefs

Sequence in context: A198587 A041570 A041572 * A041574 A144534 A041576

Adjacent sequences: A146726 A146727 A146728 * A146730 A146731 A146732

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved