A094099 Number of divisor chains of length 2n+1 which are both cyclic and anchored.

1, 1, 1, 1, 4, 2, 4, 47, 6, 6, 462, 372, 1589, 20896

Offset

0,5

Comments

A divisor chain of length n is an arrangement of 1..n such that each term is a divisor of the sum of the preceding terms.

Links

Table of n, a(n) for n=0..13.

Crossrefs

Cf. A067957, A094096, A094098, A094099.

Sequence in context: A248251 A139809 A348640 * A107046 A267184 A275927

Adjacent sequences: A094096 A094097 A094098 * A094100 A094101 A094102

Keyword

nonn,more

Author

Christopher Landauer, May 04, 2004.

Status

approved