n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 9 |
4 | 40 |
5 | 205 |
6 | 1236 |
7 | 8659 |
8 | 69280 |
9 | 623529 |
10 | 6235300 |
11 | 68588311 |
12 | 823059744 |
13 | 10699776685 |
14 | 149796873604 |
15 | 2246953104075 |
16 | 35951249665216 |
17 | 611171244308689 |
18 | 11001082397556420 |
19 | 209020565553571999 |
20 | 4180411311071440000 |
21 | 87788637532500240021 |
22 | 1931350025715005280484 |
[0,0,2,9,40,205,1236,8659,69280,623529,6235300, 68588311,823059744,10699776685,149796873604, 2246953104075,35951249665216,611171244308689, 11001082397556420,209020565553571999, 4180411311071440000,87788637532500240021, 1931350025715005280484] |