n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 3 |
4 | 12 |
5 | 48 |
6 | 197 |
7 | 903 |
8 | 4298 |
9 | 20862 |
10 | 103049 |
11 | 518859 |
12 | 2647296 |
13 | 13651092 |
14 | 71039373 |
15 | 372693519 |
16 | 1968822294 |
17 | 10463661690 |
18 | 55909013009 |
19 | 300159426963 |
20 | 1618362990804 |
21 | 8759313066840 |
22 | 47574827600981 |
23 | 259215937709463 |
[1,1,3,12,48,197,903,4298,20862,103049,518859, 2647296,13651092,71039373,372693519,1968822294, 10463661690,55909013009,300159426963, 1618362990804,8759313066840,47574827600981, 259215937709463] |