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URL: https://oeis.org/A054769

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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}.
1
1, 1, 1, 2, 5, 17, 67, 324, 1777, 11054, 76793, 591905, 4987228, 45712331, 452511382, 4812134735
OFFSET
1,4
LINKS
Sean A. Irvine, Java program (github)
CROSSREFS
Sequence in context: A122206 A104082 A166474 * A003510 A051625 A056098
KEYWORD
nonn,more
AUTHOR
John W. Layman, May 18 2000
EXTENSIONS
a(13)-a(16) from Sean A. Irvine, Feb 23 2022
STATUS
approved