A133798 a(n) = A002467(n) - 1.

0, 0, 3, 14, 75, 454, 3185, 25486, 229383, 2293838, 25232229, 302786758, 3936227867, 55107190150, 826607852265, 13225725636254, 224837335816335, 4047072044694046, 76894368849186893, 1537887376983737878

Offset

1,3

Comments

n divides a(n) and a(n+2) for odd n. 2 divides a(n) for even n. - Alexander Adamchuk, Jan 11 2008

Links

Alexander Adamchuk, Jan 11 2008, Table of n, a(n) for n = 1..51

E. W. Weisstein's World of Mathematics, Mousetrap.

Mathematica

Denominator[k=1; NestList[1+1/(k++ #1)&, 1, 50]] - 1 (* Alexander Adamchuk, Jan 11 2008 *)

Crossrefs

Cf. A002467.

Sequence in context: A200718 A063016 A246455 * A100937 A371785 A223026

Adjacent sequences: A133795 A133796 A133797 * A133799 A133800 A133801

Keyword

nonn

Author

Zak Seidov, Jan 07 2008

Status

approved