A338439 - cp's OEIS frontend

A338439 a(n) = n! * [x^n] Product_{k=1..n, gcd(n,k) = 1} (1 + x^k/k).

n	a(n)
0	1
1	1
2	0
3	3
4	8
5	50
6	144
7	2394
8	8448
9	89424
10	576000
11	20124720
12	57231360
13	3213905760
14	11285084160
15	217204092000
16	2843121254400
17	187660890063360
18	558255985459200
19	64849189355274240
20	239933887119360000
21	8405611881201561600
22	116110668405473280000
23	13912098832249673932800

[1, 1, 0, 3, 8, 50, 144, 2394, 8448, 89424, 576000, 20124720, 57231360, 3213905760, 11285084160, 217204092000, 2843121254400, 187660890063360, 558255985459200, 64849189355274240, 239933887119360000, 8405611881201561600, 116110668405473280000, 13912098832249673932800]

cp's OEIS Frontend

A338439 a(n) = n! * [x^n] Product_{k=1..n, gcd(n,k) = 1} (1 + x^k/k).

Table of values

List of values