n | a(n) |
---|---|
4 | 1 |
5 | 13 |
6 | 37 |
7 | 73 |
8 | 270 |
9 | 3023 |
10 | 31666 |
11 | 204526 |
12 | 1765714 |
13 | 30617532 |
14 | 748500437 |
15 | 15766186082 |
16 | 363909913887 |
17 | 12760152079877 |
18 | 642694450893529 |
[1,13,37,73,270,3023,31666,204526,1765714, 30617532,748500437,15766186082,363909913887, 12760152079877,642694450893529] |