A069447 - OEIS

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A069447

Half the number of n X 9 binary arrays with no path of adjacent 1's or adjacent 0's from top row to bottom row.

92

256, 1731840, 3334295986, 3616567402784

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

OFFSET

2,1

LINKS

Table of n, a(n) for n=2..5.

CROSSREFS

Cf. 2 X n A000079, n X 1 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: A283933 A016832 A103350 * A227606 A016880 A227662

Adjacent sequences: A069444 A069445 A069446 * A069448 A069449 A069450

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 22 2002

STATUS

approved