n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 8 |
5 | 38 |
6 | 210 |
7 | 1380 |
8 | 10450 |
9 | 89574 |
10 | 857352 |
11 | 9063435 |
12 | 104876887 |
13 | 1318452295 |
14 | 17893281148 |
15 | 260730668151 |
16 | 4059948975491 |
17 | 67279154450986 |
18 | 1182190856781603 |
19 | 21954973054515490 |
20 | 429690186924088871 |
[1,1,1,2,8,38,210,1380,10450,89574,857352,9063435, 104876887,1318452295,17893281148,260730668151, 4059948975491,67279154450986,1182190856781603, 21954973054515490,429690186924088871] |