n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 3 |
3 | 75 |
4 | 245 |
5 | 6615 |
6 | 22869 |
7 | 1288287 |
8 | 4601025 |
9 | 265939245 |
10 | 969738055 |
11 | 28510298817 |
12 | 105468168351 |
13 | 3138933581875 |
14 | 11734782467625 |
15 | 1409850293610375 |
16 | 5313200518272825 |
17 | 642897262711011825 |
18 | 2438232652696561875 |
19 | 74176455589813182375 |
20 | 282762879579212657625 |
[0,1,3,75,245,6615,22869,1288287,4601025, 265939245,969738055,28510298817,105468168351, 3138933581875,11734782467625,1409850293610375, 5313200518272825,642897262711011825, 2438232652696561875,74176455589813182375, 282762879579212657625] |