n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 7 |
4 | 36 |
5 | 240 |
6 | 1926 |
7 | 17815 |
8 | 184916 |
9 | 2116498 |
10 | 26391700 |
11 | 355405934 |
12 | 5134778584 |
13 | 79178537346 |
14 | 1297633495518 |
15 | 22522717498167 |
16 | 412754532495252 |
17 | 7965288555078018 |
18 | 161475849044919996 |
19 | 3431346397643014818 |
[1,1,2,7,36,240,1926,17815,184916,2116498, 26391700,355405934,5134778584,79178537346, 1297633495518,22522717498167,412754532495252, 7965288555078018,161475849044919996, 3431346397643014818] |