n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 18 |
4 | 118 |
5 | 895 |
6 | 8151 |
7 | 83916 |
8 | 977026 |
9 | 12602451 |
10 | 178880725 |
11 | 2766415036 |
12 | 46314488705 |
13 | 834067614601 |
14 | 16074694453741 |
15 | 330017679352180 |
16 | 7188779521480810 |
[1,1,4,18,118,895,8151,83916,977026,12602451, 178880725,2766415036,46314488705,834067614601, 16074694453741,330017679352180,7188779521480810] |