n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 31 |
4 | 352 |
5 | 5341 |
6 | 101824 |
7 | 2341291 |
8 | 63092992 |
9 | 1950837241 |
10 | 68093599744 |
11 | 2648776394551 |
12 | 113633946898432 |
13 | 5330308817264341 |
14 | 271416230974603264 |
15 | 14910196369733535811 |
16 | 879003840976919068672 |
17 | 55354496206857969062641 |
18 | 3708594029795800700944384 |
19 | 263391744037123969891925071 |
[1,1,4,31,352,5341,101824,2341291,63092992, 1950837241,68093599744,2648776394551, 113633946898432,5330308817264341, 271416230974603264,14910196369733535811, 879003840976919068672,55354496206857969062641, 3708594029795800700944384, 263391744037123969891925071] |