n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 7 |
5 | 40 |
6 | 355 |
7 | 4720 |
8 | 91690 |
9 | 2559980 |
10 | 101724390 |
11 | 5724370860 |
12 | 455400049575 |
13 | 51225573119870 |
14 | 8155535394029685 |
15 | 1840116104410154380 |
16 | 589128078915179209630 |
17 | 267942956094193363173030 |
18 | 173296035183231212307098790 |
19 | 159532934947213401229226873410 |
[1,1,2,7,40,355,4720,91690,2559980,101724390, 5724370860,455400049575,51225573119870, 8155535394029685,1840116104410154380, 589128078915179209630,267942956094193363173030, 173296035183231212307098790, 159532934947213401229226873410] |