A146829 - OEIS

A146829

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-0100-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 5, 29, 45, 85, 149, 631, 1787, 7789, 27255, 169603, 656441, 4413871, 19468207, 157401839

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

OFFSET

1,8

LINKS

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.0.0.1.0

.1.1.1.1.0.0.1.0

.0.0.1.0.1.1.1.0

.0.0.1.0.0.0.1.1

.1.1.0.0.0.1.0.0

.0.1.1.1.0.1.0.0

.0.1.0.0.1.1.1.1

.0.1.0.0.1.0.0.0

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved