n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 20 |
5 | 101 |
6 | 573 |
7 | 3836 |
8 | 29228 |
9 | 250749 |
10 | 2409581 |
11 | 25380120 |
12 | 294625748 |
13 | 3727542188 |
14 | 50626553988 |
15 | 738680521142 |
16 | 11501573822788 |
17 | 190418421447330 |
18 | 3344822488498265 |
19 | 61995904304519920 |
20 | 1212867413232346644 |
21 | 24965661442811799655 |
22 | 538134522243713149122 |
[1,1,2,5,20,101,573,3836,29228,250749,2409581, 25380120,294625748,3727542188,50626553988, 738680521142,11501573822788,190418421447330, 3344822488498265,61995904304519920, 1212867413232346644,24965661442811799655, 538134522243713149122] |