n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 1 |
4 | 6 |
5 | 20 |
6 | 95 |
7 | 525 |
8 | 2975 |
9 | 20300 |
10 | 143640 |
11 | 1131900 |
12 | 9548385 |
13 | 86096010 |
14 | 831475645 |
15 | 8488104625 |
16 | 91828436700 |
17 | 1045926081200 |
18 | 12517301471675 |
19 | 157022728337475 |
20 | 2058625791347125 |
21 | 28160968442356750 |
22 | 401055626173702500 |
23 | 5936491984459286250 |
[1,0,1,1,6,20,95,525,2975,20300,143640,1131900, 9548385,86096010,831475645,8488104625,91828436700, 1045926081200,12517301471675,157022728337475, 2058625791347125,28160968442356750, 401055626173702500,5936491984459286250] |