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A069449 Half the number of 4 X n binary arrays with no path of adjacent 1's or adjacent 0's from top to bottom or side to side. 0
7, 269, 5799, 95783, 1389619, 18772467, 243194821, 3070812013 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..9.

CROSSREFS

Cf. 2 X n 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: A048291 A015089 A179565 * A100465 A140031 A066413

Adjacent sequences:  A069446 A069447 A069448 * A069450 A069451 A069452

KEYWORD

nonn,changed

AUTHOR

R. H. Hardin, Mar 22 2002

STATUS

approved

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Last modified April 10 08:09 EDT 2021. Contains 342845 sequences. (Running on oeis4.)