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

2,2

Links

Table of n, a(n) for n=2..16.

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.

Sequence in context: A017730 A078953 A226713 * A103727 A120663 A261974

Adjacent sequences: A069394 A069395 A069396 * A069398 A069399 A069400

Keyword

nonn

Author

R. H. Hardin, Mar 22 2002

Status

approved