A356342 - cp's OEIS frontend

A356342 a(n) = Sum_{k=1..n} binomial(2n, k) sigma_2(k).

n	a(n)
1	2
2	34
3	281
4	2178
5	12397
6	79729
7	398932
8	2224354
9	10959221
10	56341309
11	255685080
12	1334248401
13	5892916876
14	28082515768
15	127714609741
16	604178948098
17	2590365128017
18	12284868071365
19	52160408294826
20	241445420212893
21	1049251819301974
22	4674022621994716
23	19563451165603647

[2, 34, 281, 2178, 12397, 79729, 398932, 2224354, 10959221, 56341309, 255685080, 1334248401, 5892916876, 28082515768, 127714609741, 604178948098, 2590365128017, 12284868071365, 52160408294826, 241445420212893, 1049251819301974, 4674022621994716, 19563451165603647]

cp's OEIS Frontend

A356342 a(n) = Sum_{k=1..n} binomial(2n, k) sigma_2(k).

Table of values

List of values

cp's OEIS Frontend

A356342 a(n) = Sum_{k=1..n} binomial(2*n, k) * sigma_2(k).

Table of values

List of values

A356342 a(n) = Sum_{k=1..n} binomial(2n, k) sigma_2(k).