n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 30 |
5 | 170 |
6 | 1320 |
7 | 11660 |
8 | 116600 |
9 | 1304600 |
10 | 15657400 |
11 | 230212400 |
12 | 3443176000 |
13 | 56312146000 |
14 | 1211416624000 |
15 | 23016735654000 |
16 | 460356735300000 |
17 | 12067735663300000 |
18 | 265756631234600000 |
19 | 6601271140642200000 |
[1,1,2,6,30,170,1320,11660,116600,1304600, 15657400,230212400,3443176000,56312146000, 1211416624000,23016735654000,460356735300000, 12067735663300000,265756631234600000, 6601271140642200000] |