n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 5 |
3 | 10 |
4 | 65 |
5 | 260 |
6 | 1365 |
7 | 6510 |
8 | 32865 |
9 | 162760 |
10 | 815365 |
11 | 4069010 |
12 | 20352865 |
13 | 101725260 |
14 | 508665365 |
15 | 2543131510 |
16 | 12715852865 |
17 | 63578287760 |
18 | 317892415365 |
19 | 1589457194010 |
20 | 7947290852865 |
21 | 39736429850260 |
[1,0,5,10,65,260,1365,6510,32865,162760,815365, 4069010,20352865,101725260,508665365,2543131510, 12715852865,63578287760,317892415365, 1589457194010,7947290852865,39736429850260] |