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

Author

Christopher Landauer, May 04 2004

Keywords

• nonn
• more

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.

Crossrefs

Cf. A067957, A094097, A094098, A094099.

Formula

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

Extensions

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