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A069400 Half the number of 7 X n binary arrays with a path of adjacent 1's and a path of adjacent 0's from top row to bottom row. 0
1, 1219, 587031, 182702967, 44515781333 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

Table of n, a(n) for n=2..6.

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: A252600 A293479 A031781 * A233660 A015279 A179140

Adjacent sequences:  A069397 A069398 A069399 * A069401 A069402 A069403

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 22 2002

STATUS

approved

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Last modified October 20 12:21 EDT 2021. Contains 348106 sequences. (Running on oeis4.)