n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 18 |
5 | 78 |
6 | 415 |
7 | 2467 |
8 | 16212 |
9 | 114623 |
10 | 863229 |
11 | 6858780 |
12 | 57156213 |
13 | 497147291 |
14 | 4497291265 |
15 | 42189445764 |
16 | 409478828567 |
17 | 4103901097024 |
18 | 42403116824997 |
19 | 451059832858894 |
20 | 4933844398096693 |
21 | 55436157047213427 |
22 | 639215949145395559 |
23 | 7557505365363885063 |
[1,1,2,5,18,78,415,2467,16212,114623,863229, 6858780,57156213,497147291,4497291265,42189445764, 409478828567,4103901097024,42403116824997, 451059832858894,4933844398096693, 55436157047213427,639215949145395559, 7557505365363885063] |