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A069449
Half the number of 4 X n binary arrays with no path of adjacent 1's or adjacent 0's from top to bottom or side to side.
0
7, 269, 5799, 95783, 1389619, 18772467, 243194821, 3070812013
OFFSET
2,1
CROSSREFS
Cf. 2 X n A000225, vertical path of 1 A069361-A069395, vertical paths of 0+1 A069396-A069416, vertical path of 1 not 0 A069417-A069428, no vertical paths A069429-A069447, no horizontal or vertical paths A069448-A069452.
Sequence in context: A048291 A015089 A179565 * A100465 A140031 A066413
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 22 2002
STATUS
approved