A147171 - OEIS

A147171

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1111-0010-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 193, 369, 2595, 6071, 68113, 166829, 3392025, 10054713, 1656174053, 6422563367, 1047960128407, 4842120420549, 791850842457727

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

OFFSET

1,9

LINKS

EXAMPLE

Maximal 9 X 9 example

.0.0.0.1.0.1.0.0.0

.1.1.1.1.0.1.1.1.1

.0.1.0.0.0.0.0.1.0

.0.0.0.0.0.0.0.0.0

.1.0.0.0.0.0.0.0.1

.1.1.1.1.0.1.1.1.1

.0.0.1.0.0.0.1.0.0

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved