A356345 - cp's OEIS frontend

A356345 a(n) = Sum_{k=1..n} binomial(2k, k) sigma_2(k).

n	a(n)
1	2
2	32
3	232
4	1702
5	8254
6	54454
7	226054
8	1320004
9	5744424
10	29762704
11	115825408
12	683698168
13	2451800168
14	12480950168
15	52811505368
16	257779918358
17	934525722158
18	5063712283658
19	17858697779258
20	93122902514978
21	362251839734978
22	1645752207604178
23	6009470493232178
24	33419933623867178

[2, 32, 232, 1702, 8254, 54454, 226054, 1320004, 5744424, 29762704, 115825408, 683698168, 2451800168, 12480950168, 52811505368, 257779918358, 934525722158, 5063712283658, 17858697779258, 93122902514978, 362251839734978, 1645752207604178, 6009470493232178, 33419933623867178]

cp's OEIS Frontend

A356345 a(n) = Sum_{k=1..n} binomial(2k, k) sigma_2(k).

Table of values

List of values

cp's OEIS Frontend

A356345 a(n) = Sum_{k=1..n} binomial(2*k, k) * sigma_2(k).

Table of values

List of values

A356345 a(n) = Sum_{k=1..n} binomial(2k, k) sigma_2(k).