A069397 Half the number of 4 X n binary arrays with a path of adjacent 1's and a path of adjacent 0's from top row to bottom row.

1, 67, 2427, 66579, 1565371, 33438451, 669776139, 12817737731, 237180629275, 4277806868563, 75628309151275, 1315968756706339, 22606389934281147, 384286142618740851, 6475978445076745163

Offset: 2

Author

R. H. Hardin, Mar 22 2002

Keywords

• nonn

Crossrefs

Cf. 1 X n A000225, 2 X n A016269, 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.