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A054769 Number of integer n-tuples {x(1},x(2),...,x(n)} with the following properties: (1) x(1)=1 and, for k>1, if d=x(k)-x(k-1), then (2) d is relatively prime to x(k-1) and (3) d=x(i) for some i in {1,2,...,(k-1)}. 0
1, 1, 1, 2, 5, 17, 67, 324, 1777, 11054, 76793, 591905 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..12.

CROSSREFS

Sequence in context: A122206 A104082 A166474 * A003510 A051625 A056098

Adjacent sequences:  A054766 A054767 A054768 * A054770 A054771 A054772

KEYWORD

nonn

AUTHOR

John W. Layman, May 18 2000

STATUS

approved

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Last modified October 20 19:44 EDT 2018. Contains 316401 sequences. (Running on oeis4.)