n | a(n) |
---|---|
0 | 1 |
1 | 7 |
2 | 42 |
3 | 252 |
4 | 1491 |
5 | 8820 |
6 | 52185 |
7 | 308700 |
8 | 1826160 |
9 | 10802925 |
10 | 63906150 |
11 | 378045675 |
12 | 2236381350 |
13 | 13229622000 |
14 | 78261652875 |
15 | 462967596000 |
16 | 2738748634125 |
17 | 16201445085000 |
18 | 95841881782500 |
19 | 566965863568125 |
20 | 3353964722666250 |
[1,7,42,252,1491,8820,52185,308700,1826160, 10802925,63906150,378045675,2236381350, 13229622000,78261652875,462967596000, 2738748634125,16201445085000,95841881782500, 566965863568125,3353964722666250] |