n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 28 |
4 | 298 |
5 | 4186 |
6 | 74116 |
7 | 1578340 |
8 | 39394972 |
9 | 1127378332 |
10 | 36411516496 |
11 | 1310173698736 |
12 | 51982859674648 |
13 | 2254757407407064 |
14 | 106150698182657584 |
15 | 5390926011965379376 |
16 | 293782337188718257936 |
17 | 17100576708082841577232 |
18 | 1058920120014192744673600 |
[1,1,4,28,298,4186,74116,1578340,39394972, 1127378332,36411516496,1310173698736, 51982859674648,2254757407407064, 106150698182657584,5390926011965379376, 293782337188718257936,17100576708082841577232, 1058920120014192744673600] |