n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 3 |
5 | 10 |
6 | 24 |
7 | 130 |
8 | 504 |
9 | 4420 |
10 | 27720 |
11 | 393380 |
12 | 3991680 |
13 | 91657540 |
14 | 1504863360 |
15 | 55911099400 |
16 | 1485300136320 |
17 | 89290025741800 |
18 | 3838015552250880 |
19 | 373321597626465800 |
20 | 25964175210977203200 |
21 | 4086378207619294646800 |
[1,1,2,3,10,24,130,504,4420,27720,393380,3991680, 91657540,1504863360,55911099400,1485300136320, 89290025741800,3838015552250880, 373321597626465800,25964175210977203200, 4086378207619294646800] |