n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 22 |
6 | 92 |
7 | 426 |
8 | 2145 |
9 | 11589 |
10 | 66425 |
11 | 399682 |
12 | 2500037 |
13 | 16115347 |
14 | 106266473 |
15 | 712602272 |
16 | 4837372576 |
17 | 33128183406 |
18 | 228308233098 |
19 | 1580495251012 |
20 | 10976092266889 |
21 | 76398165848091 |
22 | 532614662149795 |
23 | 3717370694711130 |
[1,1,2,6,22,92,426,2145,11589,66425,399682, 2500037,16115347,106266473,712602272,4837372576, 33128183406,228308233098,1580495251012, 10976092266889,76398165848091,532614662149795, 3717370694711130] |