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, 4118, 12815, 130528, 1942045, 163775, 18340336, 5065878, 3607762

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..21.

Formula

a(n) = A094097(2n+1). - Martin Fuller, Jul 18 2025

Crossrefs

Cf. A067957, A094097, A094098, A094099.

Sequence in context: A248251 A139809 A348640 * A107046 A267184 A377647

Adjacent sequences: A094096 A094097 A094098 * A094100 A094101 A094102

Keyword

nonn,more

Author

Christopher Landauer, May 04 2004

Extensions

a(14)-a(21) from A094097 by Martin Fuller, Jul 18 2025

Status

approved