n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 21 |
3 | 220 |
4 | 3060 |
5 | 53130 |
6 | 1107568 |
7 | 26978328 |
8 | 752538150 |
9 | 23667689815 |
10 | 828931106355 |
11 | 32006008361808 |
12 | 1350990969850340 |
13 | 61902409203193230 |
14 | 3060335715568296000 |
15 | 162392216278033616560 |
16 | 9206887338937200407418 |
[1,3,21,220,3060,53130,1107568,26978328,752538150, 23667689815,828931106355,32006008361808, 1350990969850340,61902409203193230, 3060335715568296000,162392216278033616560, 9206887338937200407418] |