n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 8 |
5 | 64 |
6 | 504 |
7 | 4132 |
8 | 36224 |
9 | 343197 |
10 | 3528800 |
11 | 39382654 |
12 | 476015616 |
13 | 6209617492 |
14 | 87072877696 |
15 | 1307012632486 |
16 | 20918494920704 |
17 | 355658666311252 |
18 | 6402175346437632 |
19 | 121643693845767057 |
20 | 2432891768176640000 |
21 | 51090865734892274539 |
22 | 1124000143459306268672 |
[0,0,0,0,8,64,504,4132,36224,343197,3528800, 39382654,476015616,6209617492,87072877696, 1307012632486,20918494920704,355658666311252, 6402175346437632,121643693845767057, 2432891768176640000,51090865734892274539, 1124000143459306268672] |