A356338 - cp's OEIS frontend

A356338 a(n) = Sum_{k=1..n} binomial(2n, n-k) sigma(k).

n	a(n)
1	1
2	7
3	37
4	179
5	826
6	3703
7	16283
8	70619
9	303121
10	1290682
11	5460511
12	22981019
13	96296552
14	402024497
15	1673116072
16	6944105579
17	28752345362
18	118801061059
19	489959398840
20	2017339105514
21	8293732341134
22	34051489445365
23	139634028015269
24	571955737066307
25	2340402722605976
26	9567794393004816

[1, 7, 37, 179, 826, 3703, 16283, 70619, 303121, 1290682, 5460511, 22981019, 96296552, 402024497, 1673116072, 6944105579, 28752345362, 118801061059, 489959398840, 2017339105514, 8293732341134, 34051489445365, 139634028015269, 571955737066307, 2340402722605976, 9567794393004816]

cp's OEIS Frontend

A356338 a(n) = Sum_{k=1..n} binomial(2n, n-k) sigma(k).

Table of values

List of values

cp's OEIS Frontend

A356338 a(n) = Sum_{k=1..n} binomial(2*n, n-k) * sigma(k).

Table of values

List of values

A356338 a(n) = Sum_{k=1..n} binomial(2n, n-k) sigma(k).