n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 20 |
5 | 81 |
6 | 438 |
7 | 2477 |
8 | 16680 |
9 | 120481 |
10 | 973034 |
11 | 8496245 |
12 | 80252732 |
13 | 817734321 |
14 | 8859646110 |
15 | 102873611549 |
16 | 1258403748432 |
17 | 16372688411713 |
18 | 223202277906386 |
19 | 3213260867586149 |
20 | 48295209177888356 |
[0,1,2,5,20,81,438,2477,16680,120481,973034, 8496245,80252732,817734321,8859646110, 102873611549,1258403748432,16372688411713, 223202277906386,3213260867586149, 48295209177888356] |