A356344 - cp's OEIS frontend

A356344 a(n) = Sum_{k=1..n} binomial(2k, k) sigma(k).

n	a(n)
1	2
2	20
3	100
4	590
5	2102
6	13190
7	40646
8	233696
9	865756
10	4191364
11	12656548
12	88372916
13	233981316
14	1196779716
15	4919600196
16	23553092286
17	65558004246
18	419488280946
19	1126393556946
20	6915947767386
21	24140199749466
22	99887762443386
23	297490099905786
24	2232346320891786
25	6151075120462098

[2, 20, 100, 590, 2102, 13190, 40646, 233696, 865756, 4191364, 12656548, 88372916, 233981316, 1196779716, 4919600196, 23553092286, 65558004246, 419488280946, 1126393556946, 6915947767386, 24140199749466, 99887762443386, 297490099905786, 2232346320891786, 6151075120462098]

cp's OEIS Frontend

A356344 a(n) = Sum_{k=1..n} binomial(2k, k) sigma(k).

Table of values

List of values

cp's OEIS Frontend

A356344 a(n) = Sum_{k=1..n} binomial(2*k, k) * sigma(k).

Table of values

List of values

A356344 a(n) = Sum_{k=1..n} binomial(2k, k) sigma(k).