A146171 - OEIS

A146171

Number of n X n binary arrays with all ones connected only in a 110-100-111 pattern in any orientation.

1, 1, 9, 33, 89, 853, 34557, 906369, 18920177, 1254520087, 193995577775, 29705523106027, 5297235657600881

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

OFFSET

1,3

LINKS

EXAMPLE

Maximal 8 X 8 example

.1.1.1.0.0.0.0.0

.1.0.0.0.0.0.1.1

.1.1.0.0.0.0.0.1

.0.0.0.0.0.1.1.1

.0.0.1.1.1.0.0.0

.1.1.0.0.1.0.1.1

.1.0.0.1.1.0.0.1

.1.1.1.0.0.1.1.1

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2008

STATUS

approved