A330494 - cp's OEIS frontend

A330494 a(n) = Sum_{k=1..n} (-1)^(n-k) * Stirling1(n,k) * (k-1)! * sigma(k), where sigma = A000203.

n	a(n)
1	1
2	4
3	19
4	129
5	1018
6	9912
7	111074
8	1416398
9	20295208
10	323437728
11	5657339928
12	107765338920
13	2223272444976
14	49399021063584
15	1175549092374672
16	29822113966614768
17	803485297880792064
18	22917198585269729664
19	689927737384840662144
20	21861972842959846530432

[1, 4, 19, 129, 1018, 9912, 111074, 1416398, 20295208, 323437728, 5657339928, 107765338920, 2223272444976, 49399021063584, 1175549092374672, 29822113966614768, 803485297880792064, 22917198585269729664, 689927737384840662144, 21861972842959846530432]

cp's OEIS Frontend

A330494 a(n) = Sum_{k=1..n} (-1)^(n-k) * Stirling1(n,k) * (k-1)! * sigma(k), where sigma = A000203.

Table of values

List of values