A068338 - cp's OEIS frontend

A068338 a(n) = n!^2 * Sum_{k=1..n} mu(k)/k^2, where mu(k) is the Moebius function.

n	a(n)
1	1
2	3
3	23
4	368
5	8624
6	324864
7	15399936
8	985595904
9	79833268224
10	8115008716800
11	968747865292800
12	139499692602163200
13	23346005516963020800
14	4614592869368384716800
15	1045883450064438558720000
16	267746163216496271032320000
17	76940878032870027275796480000

[1, 3, 23, 368, 8624, 324864, 15399936, 985595904, 79833268224, 8115008716800, 968747865292800, 139499692602163200, 23346005516963020800, 4614592869368384716800, 1045883450064438558720000, 267746163216496271032320000, 76940878032870027275796480000]

cp's OEIS Frontend

A068338 a(n) = n!^2 * Sum_{k=1..n} mu(k)/k^2, where mu(k) is the Moebius function.

Table of values

List of values