n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 1 |
5 | 1 |
6 | 2 |
7 | 5 |
8 | 15 |
9 | 58 |
10 | 275 |
11 | 1505 |
12 | 9003 |
13 | 56931 |
14 | 372973 |
15 | 2506312 |
16 | 17165954 |
17 | 119398333 |
18 | 841244274 |
19 | 5993093551 |
20 | 43109340222 |
21 | 312747109787 |
22 | 2286190318744 |
23 | 16826338257708 |
24 | 124605344758149 |
25 | 927910207739261 |
26 | 6945172081954449 |
27 | 52225283886702922 |
[0,0,1,1,1,2,5,15,58,275,1505,9003,56931,372973, 2506312,17165954,119398333,841244274,5993093551, 43109340222,312747109787,2286190318744, 16826338257708,124605344758149,927910207739261, 6945172081954449,52225283886702922] |