n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 3 |
3 | 15 |
4 | 82 |
5 | 485 |
6 | 3039 |
7 | 19862 |
8 | 133969 |
9 | 925805 |
10 | 6521690 |
11 | 46658955 |
12 | 338115321 |
13 | 2476585674 |
14 | 18306446887 |
15 | 136384608971 |
16 | 1023041170426 |
17 | 7720127405881 |
18 | 58567844563843 |
19 | 446422706023630 |
20 | 3417223098702669 |
21 | 26257867836211825 |
[0,1,3,15,82,485,3039,19862,133969,925805,6521690, 46658955,338115321,2476585674,18306446887, 136384608971,1023041170426,7720127405881, 58567844563843,446422706023630,3417223098702669, 26257867836211825] |