n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 7 |
4 | 31 |
5 | 162 |
6 | 968 |
7 | 6481 |
8 | 47893 |
9 | 386098 |
10 | 3364562 |
11 | 31460324 |
12 | 313743665 |
13 | 3320211313 |
14 | 37124987124 |
15 | 436985496790 |
16 | 5397178181290 |
17 | 69748452377058 |
18 | 940762812167126 |
19 | 13213888481979449 |
20 | 192891251215160017 |
[1,1,2,7,31,162,968,6481,47893,386098,3364562, 31460324,313743665,3320211313,37124987124, 436985496790,5397178181290,69748452377058, 940762812167126,13213888481979449, 192891251215160017] |