n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 3 |
4 | 10 |
5 | 46 |
6 | 244 |
7 | 1481 |
8 | 10020 |
9 | 74400 |
10 | 599573 |
11 | 5200284 |
12 | 48223360 |
13 | 475557054 |
14 | 4965035754 |
15 | 54672110310 |
16 | 632853655686 |
17 | 7678552433184 |
18 | 97404631390960 |
19 | 1288861146261679 |
20 | 17752479062092470 |
21 | 254051633672160696 |
[1,1,1,3,10,46,244,1481,10020,74400,599573, 5200284,48223360,475557054,4965035754,54672110310, 632853655686,7678552433184,97404631390960, 1288861146261679,17752479062092470, 254051633672160696] |