n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 10 |
3 | 38 |
4 | 168 |
5 | 872 |
6 | 5296 |
7 | 37200 |
8 | 297856 |
9 | 2681216 |
10 | 26813184 |
11 | 294947072 |
12 | 3539368960 |
13 | 46011804672 |
14 | 644165281792 |
15 | 9662479259648 |
16 | 154599668219904 |
17 | 2628194359869440 |
18 | 47307498477912064 |
19 | 898842471080853504 |
20 | 17976849421618118656 |
21 | 377513837853982588928 |
[1,3,10,38,168,872,5296,37200,297856,2681216, 26813184,294947072,3539368960,46011804672, 644165281792,9662479259648,154599668219904, 2628194359869440,47307498477912064, 898842471080853504,17976849421618118656, 377513837853982588928] |