n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 9 |
4 | 50 |
5 | 310 |
6 | 2056 |
7 | 14273 |
8 | 102410 |
9 | 753390 |
10 | 5651948 |
11 | 43074218 |
12 | 332553252 |
13 | 2595442616 |
14 | 20443630100 |
15 | 162308182577 |
16 | 1297503030106 |
17 | 10435055801110 |
18 | 84371602316812 |
19 | 685424273207630 |
20 | 5592040955107420 |
21 | 45798007929729828 |
[1,2,9,50,310,2056,14273,102410,753390,5651948, 43074218,332553252,2595442616,20443630100, 162308182577,1297503030106,10435055801110, 84371602316812,685424273207630,5592040955107420, 45798007929729828] |