A356341 - cp's OEIS frontend

A356341 a(n) = Sum_{k=1..n} binomial(2n, k) sigma(k).

n	a(n)
1	2
2	22
3	131
4	806
5	3607
6	20395
7	84254
8	422230
9	1842359
10	8616007
11	33843614
12	173724659
13	676938316
14	2983855666
15	12806013721
16	57981927158
17	223432922515
18	1040923729567
19	4004885305320
20	18277809794671
21	75668287229078
22	317458937099194
23	1215454524390767
24	5785782106653667

[2, 22, 131, 806, 3607, 20395, 84254, 422230, 1842359, 8616007, 33843614, 173724659, 676938316, 2983855666, 12806013721, 57981927158, 223432922515, 1040923729567, 4004885305320, 18277809794671, 75668287229078, 317458937099194, 1215454524390767, 5785782106653667]

cp's OEIS Frontend

A356341 a(n) = Sum_{k=1..n} binomial(2n, k) sigma(k).

Table of values

List of values

cp's OEIS Frontend

A356341 a(n) = Sum_{k=1..n} binomial(2*n, k) * sigma(k).

Table of values

List of values

A356341 a(n) = Sum_{k=1..n} binomial(2n, k) sigma(k).