n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 6 |
4 | 25 |
5 | 140 |
6 | 1225 |
7 | 11410 |
8 | 110353 |
9 | 1260696 |
10 | 16597745 |
11 | 233501598 |
12 | 3534940649 |
13 | 58867014180 |
14 | 1060745261433 |
15 | 20315286728490 |
16 | 414362268698017 |
17 | 9016753267197744 |
18 | 207836963025430369 |
19 | 5046234392527982902 |
[1,0,1,6,25,140,1225,11410,110353,1260696, 16597745,233501598,3534940649,58867014180, 1060745261433,20315286728490,414362268698017, 9016753267197744,207836963025430369, 5046234392527982902] |