A069397 - OEIS

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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

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

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