n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 40 |
6 | 155 |
7 | 1050 |
8 | 7175 |
9 | 49000 |
10 | 427140 |
11 | 3649800 |
12 | 34634985 |
13 | 359579220 |
14 | 3844835995 |
15 | 44765971250 |
16 | 546966720300 |
17 | 7013372766400 |
18 | 95334357393275 |
19 | 1349949069418950 |
20 | 20031683836289125 |
21 | 310545507994221500 |
22 | 5003248923131208750 |
23 | 83939793691225972500 |
[1,0,1,2,6,40,155,1050,7175,49000,427140,3649800, 34634985,359579220,3844835995,44765971250, 546966720300,7013372766400,95334357393275, 1349949069418950,20031683836289125, 310545507994221500,5003248923131208750, 83939793691225972500] |