A120284 - cp's OEIS frontend

A120284 Numerator of absolute value of Sum_{k=1..n} (-1)^(k+1)(2k+1)*(Sum_{i=1..k} 1/i).

n	a(n)
1	3
2	9
3	25
4	125
5	147
6	343
7	761
8	6849
9	7381
10	81191
11	86021
12	1118273
13	1171733
14	1171733
15	2436559
16	41421503
17	42822903
18	271211719
19	279175675
20	55835135
21	19093197
22	439143531
23	1347822955
24	33695573875
25	34395742267
26	309561680403
27	315404588903

[3, 9, 25, 125, 147, 343, 761, 6849, 7381, 81191, 86021, 1118273, 1171733, 1171733, 2436559, 41421503, 42822903, 271211719, 279175675, 55835135, 19093197, 439143531, 1347822955, 33695573875, 34395742267, 309561680403, 315404588903]

cp's OEIS Frontend

A120284 Numerator of absolute value of Sum_{k=1..n} (-1)^(k+1)(2k+1)*(Sum_{i=1..k} 1/i).

Table of values

List of values

cp's OEIS Frontend

A120284 Numerator of absolute value of Sum_{k=1..n} (-1)^(k+1)*(2*k+1)*(Sum_{i=1..k} 1/i).

Table of values

List of values

A120284 Numerator of absolute value of Sum_{k=1..n} (-1)^(k+1)(2k+1)*(Sum_{i=1..k} 1/i).