n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 30 |
3 | 250 |
4 | 2236 |
5 | 20979 |
6 | 203748 |
7 | 2031054 |
8 | 20662980 |
9 | 213679114 |
10 | 2239507936 |
11 | 23735786529 |
12 | 253964904550 |
13 | 2739547645735 |
14 | 29761236016632 |
15 | 325318710375558 |
16 | 3575517449089572 |
17 | 39489206184518220 |
18 | 438032736572732520 |
[1,4,30,250,2236,20979,203748,2031054,20662980, 213679114,2239507936,23735786529,253964904550, 2739547645735,29761236016632,325318710375558, 3575517449089572,39489206184518220, 438032736572732520] |