n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 28 |
4 | 245 |
5 | 2402 |
6 | 25235 |
7 | 277756 |
8 | 3161523 |
9 | 36909060 |
10 | 439516495 |
11 | 5317812722 |
12 | 65188448962 |
13 | 807898166866 |
14 | 10105819846135 |
15 | 127423095583448 |
16 | 1617823588067512 |
17 | 20665678033803324 |
18 | 265397856665673136 |
19 | 3424669486515830710 |
20 | 44381054246951597644 |
21 | 577365058173382341896 |
[1,1,4,28,245,2402,25235,277756,3161523,36909060, 439516495,5317812722,65188448962,807898166866, 10105819846135,127423095583448,1617823588067512, 20665678033803324,265397856665673136, 3424669486515830710,44381054246951597644, 577365058173382341896] |