n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 5 |
3 | 5 |
4 | 74 |
5 | 154 |
6 | 2484 |
7 | 8028 |
8 | 149904 |
9 | 663696 |
10 | 14257440 |
11 | 80627040 |
12 | 1965444480 |
13 | 13575738240 |
14 | 370643938560 |
15 | 3031488633600 |
16 | 91657072281600 |
17 | 867718162483200 |
18 | 28779361764249600 |
19 | 309920046408806400 |
20 | 11185850044938240000 |
[1,0,5,5,74,154,2484,8028,149904,663696,14257440, 80627040,1965444480,13575738240,370643938560, 3031488633600,91657072281600,867718162483200, 28779361764249600,309920046408806400, 11185850044938240000] |