n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 4 |
4 | 17 |
5 | 126 |
6 | 832 |
7 | 8646 |
8 | 83281 |
9 | 1035670 |
10 | 13155686 |
11 | 200866326 |
12 | 3090454952 |
13 | 55704133590 |
14 | 1028017657682 |
15 | 21123701763534 |
16 | 453986750729681 |
17 | 10610386574074710 |
18 | 258237311112260158 |
[1,1,4,17,126,832,8646,83281,1035670,13155686, 200866326,3090454952,55704133590,1028017657682, 21123701763534,453986750729681,10610386574074710, 258237311112260158] |