A146665 - OEIS

A146665

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-0001 pattern in any orientation.

1, 1, 1, 1, 5, 25, 67, 401, 2363, 17629, 144263, 1829205, 25576287, 554261927, 12075864101

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,5

LINKS

EXAMPLE

Maximal 8 X 8 example

.0.0.1.1.0.0.1.1

.1.1.1.0.1.1.1.0

.1.0.0.0.1.0.0.1

.0.0.1.1.0.1.1.1

.1.1.1.0.1.1.0.0

.1.0.0.1.0.0.0.1

.0.1.1.1.0.1.1.1

.1.1.0.0.1.1.0.0

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved