n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 31 |
4 | 227 |
5 | 1991 |
6 | 19415 |
7 | 203456 |
8 | 2248356 |
9 | 25887400 |
10 | 307993016 |
11 | 3763786812 |
12 | 47032778956 |
13 | 598933188956 |
14 | 7751562502556 |
15 | 101741582076581 |
16 | 1351906409905481 |
17 | 18159677984049581 |
18 | 246298405721739581 |
[1,2,6,31,227,1991,19415,203456,2248356,25887400, 307993016,3763786812,47032778956,598933188956, 7751562502556,101741582076581,1351906409905481, 18159677984049581,246298405721739581] |