A146152 - OEIS

A146152

Number of n X n binary arrays with all ones connected only either as two by three or three by two blocks.

1, 1, 5, 13, 47, 375, 3972, 47068, 892007, 26215027, 1025956370, 55524872121, 4474246357794, 516153334755405, 83220252331733856, 19182699863712254411

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

OFFSET

1,3

LINKS

EXAMPLE

Maximal 8 X 8 example

.1.1.1.0.0.1.1.1

.0.0.0.0.0.0.0.0

.1.1.1.0.0.1.1.1

.0.0.0.0.0.0.0.0

.0.1.1.1.0.1.1.1

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2008

STATUS

approved