n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 21 |
4 | 120 |
5 | 2080 |
6 | 11781 |
7 | 203841 |
8 | 1154440 |
9 | 19974360 |
10 | 113123361 |
11 | 1957283461 |
12 | 11084934960 |
13 | 191793804840 |
14 | 1086210502741 |
15 | 18793835590881 |
16 | 106437544333680 |
17 | 1841604094101520 |
18 | 10429793134197921 |
19 | 180458407386358101 |
20 | 1022013289607062600 |
[0,1,21,120,2080,11781,203841,1154440,19974360, 113123361,1957283461,11084934960,191793804840, 1086210502741,18793835590881,106437544333680, 1841604094101520,10429793134197921, 180458407386358101,1022013289607062600] |