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A069452 Half the number of 7 X n binary arrays with no path of adjacent 1's or adjacent 0's from top to bottom or side to side. 93
63, 56757, 18772467, 3912171001 (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 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: A239672 A136677 A135812 * A229846 A230674 A229933

Adjacent sequences:  A069449 A069450 A069451 * A069453 A069454 A069455

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 22 2002.

STATUS

approved

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Last modified June 19 19:11 EDT 2019. Contains 324222 sequences. (Running on oeis4.)