A146822 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1110-0111 pattern in any orientation.

1, 1, 1, 1, 5, 21, 63, 331, 1837, 11817, 91941, 951301, 13059325, 223458589, 4681971763

Offset

1,5

Links

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

Example

Maximal 8 X 8 example
.1.0.1.1.0.1.1.0
.1.1.0.1.1.0.1.1
.1.1.0.1.1.0.1.1
.0.1.1.0.1.0.0.1
.1.0.0.1.0.1.1.0
.1.1.0.1.1.0.1.1
.1.1.0.1.1.0.1.1
.0.1.1.0.1.1.0.1

Crossrefs

Sequence in context: A196631 A357723 A342379 * A146223 A181093 A055384

Adjacent sequences: A146819 A146820 A146821 * A146823 A146824 A146825

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved