A147439 - OEIS

A147439

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1010-1111-1010 pattern in any orientation.

1, 1, 1, 1, 1, 3, 9, 19, 46, 175, 744, 3837, 22276, 149923, 1180818, 11235559

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

OFFSET

1,6

LINKS

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.0.1.0

.0.0.0.0.1.1.1.1

.0.0.0.0.1.0.1.0

.0.0.0.0.0.0.0.0

.1.1.1.0.0.0.0.0

.0.1.0.0.0.0.0.0

.1.1.1.0.0.0.0.0

.0.1.0.0.0.0.0.0

CROSSREFS

KEYWORD

nonn

AUTHOR

STATUS

approved