n | a(n) |
---|---|
1 | 1 |
2 | 8 |
3 | 51 |
4 | 310 |
5 | 1865 |
6 | 11196 |
7 | 67183 |
8 | 403106 |
9 | 2418645 |
10 | 14511880 |
11 | 87071291 |
12 | 522427758 |
13 | 3134566561 |
14 | 18807399380 |
15 | 112844396295 |
16 | 677066377786 |
17 | 4062398266733 |
18 | 24374389600416 |
19 | 146246337602515 |
20 | 877478025615110 |
[1,8,51,310,1865,11196,67183,403106,2418645, 14511880,87071291,522427758,3134566561, 18807399380,112844396295,677066377786, 4062398266733,24374389600416,146246337602515, 877478025615110] |