A354508 - cp's OEIS frontend

A354508 a(n) = n! * Sum_{k=1..n} ( Sum_{d|k} (-1)^(k/d+1) * d^2 )/(k * (n-k)!).

n	a(n)
1	1
2	5
3	32
4	168
5	1189
6	8785
7	77384
8	646296
9	7306737
10	79997893
11	1005481784
12	12518370128
13	184109233125
14	2671256865121
15	47934480000112
16	754158322407248
17	13813898274148737
18	262680987222463269
19	5518034466415262320
20	107988236156057411096
21	2605128008760639636677

[1, 5, 32, 168, 1189, 8785, 77384, 646296, 7306737, 79997893, 1005481784, 12518370128, 184109233125, 2671256865121, 47934480000112, 754158322407248, 13813898274148737, 262680987222463269, 5518034466415262320, 107988236156057411096, 2605128008760639636677]

cp's OEIS Frontend

A354508 a(n) = n! * Sum_{k=1..n} ( Sum_{d|k} (-1)^(k/d+1) * d^2 )/(k * (n-k)!).

Table of values

List of values