n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 20 |
3 | 0 |
4 | 1140 |
5 | 480 |
6 | 102800 |
7 | 151200 |
8 | 12310900 |
9 | 38707200 |
10 | 1812247920 |
11 | 9574488000 |
12 | 313983978000 |
13 | 2391608419200 |
14 | 62051403928800 |
15 | 611744666332800 |
16 | 13627749414064500 |
17 | 160896284989440000 |
18 | 3253345101771050000 |
19 | 43527416858084016000 |
20 | 829176006298475046640 |
[1,0,20,0,1140,480,102800,151200,12310900, 38707200,1812247920,9574488000,313983978000, 2391608419200,62051403928800,611744666332800, 13627749414064500,160896284989440000, 3253345101771050000,43527416858084016000, 829176006298475046640] |