A278051 - cp's OEIS frontend

A278051 Let v = list of denominators of Farey series of order n (see A006843); let b(n) = Sum 1/(k+k'), where (k,k') are pairs of successive terms of v; a(n) = denominator of b(n).

n	a(n)
1	2
2	3
3	10
4	35
5	252
6	2772
7	6435
8	858
9	680680
10	12932920
11	5290740
12	121687020
13	1029659400
14	3088978200
15	582272390700
16	18050444111700
17	128701918800
18	25740383760
19	70301729698200
20	10043104242600
21	109530094869795600
22	523310453266801200
23	51193413906534900
24	481218090721428060

[2, 3, 10, 35, 252, 2772, 6435, 858, 680680, 12932920, 5290740, 121687020, 1029659400, 3088978200, 582272390700, 18050444111700, 128701918800, 25740383760, 70301729698200, 10043104242600, 109530094869795600, 523310453266801200, 51193413906534900, 481218090721428060]

cp's OEIS Frontend

A278051 Let v = list of denominators of Farey series of order n (see A006843); let b(n) = Sum 1/(k+k'), where (k,k') are pairs of successive terms of v; a(n) = denominator of b(n).

Table of values

List of values