A330495 - cp's OEIS frontend

A330495 a(n) = Sum_{k=1..n} (-1)^(n-k) * Stirling1(n,k) * (k-1)! * sigma_2(k), where sigma_2 = A001157.

n	a(n)
1	1
2	6
3	37
4	307
5	2858
6	32060
7	405830
8	5777354
9	91400200
10	1593023040
11	30251766840
12	622016655816
13	13777150847952
14	327040289212320
15	8280040187137200
16	222696435041359824
17	6341359225470493440
18	190609840724078576256
19	6031297367477133540480
20	200389374367707186619776

[1, 6, 37, 307, 2858, 32060, 405830, 5777354, 91400200, 1593023040, 30251766840, 622016655816, 13777150847952, 327040289212320, 8280040187137200, 222696435041359824, 6341359225470493440, 190609840724078576256, 6031297367477133540480, 200389374367707186619776]

cp's OEIS Frontend

A330495 a(n) = Sum_{k=1..n} (-1)^(n-k) * Stirling1(n,k) * (k-1)! * sigma_2(k), where sigma_2 = A001157.

Table of values

List of values