n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 30 |
3 | 246 |
4 | 2037 |
5 | 16886 |
6 | 139997 |
7 | 1160693 |
8 | 9623140 |
9 | 79784098 |
10 | 661478734 |
11 | 5484227157 |
12 | 45468956106 |
13 | 376976720745 |
14 | 3125460977225 |
15 | 25912757426660 |
16 | 214839027697334 |
17 | 1781200165693270 |
18 | 14767680082482085 |
19 | 122436758775876478 |
[1,4,30,246,2037,16886,139997,1160693,9623140, 79784098,661478734,5484227157,45468956106, 376976720745,3125460977225,25912757426660, 214839027697334,1781200165693270, 14767680082482085,122436758775876478] |