A376051 a(n) is the denominator of the sum S(n) defined in A376050.

2, 6, 15, 105, 1890, 1787940, 1598366509740, 170318366632160334167580, 4144049430320998104357181695998976956266032780, 903849772681252048573050443706467978048458261112444760582668531605732820714345840478376380

Offset

1,1

Links

Table of n, a(n) for n=1..10.

Example

The first few values of S(n) are 1/2, 5/6, 14/15, 103/105, 1889/1890, 1787939/1787940, 1598366509739/1598366509740, ... Note S(4) is exceptional, in that the numerator and denominator differ by 2 instead of 1.

Crossrefs

Cf. A374663, A375516, A375531, A375532, A375781, A375522, A376048, A376049, A376050.

Sequence in context: A038111 A356803 A375522 * A261726 A302775 A181993

Adjacent sequences: A376048 A376049 A376050 * A376052 A376053 A376054

Keyword

nonn,base,frac

Author

N. J. A. Sloane, Sep 13 2024

Status

approved