n | a(n) |
---|---|
0 | 4 |
1 | 20 |
2 | 159 |
3 | 1581 |
4 | 16558 |
5 | 177149 |
6 | 1914605 |
7 | 20805629 |
8 | 226837179 |
9 | 2478392741 |
10 | 27117710875 |
11 | 297017215757 |
12 | 3255654522710 |
13 | 35706184176828 |
14 | 391779075776400 |
15 | 4300227701910871 |
16 | 47213296523342317 |
17 | 518486398180399368 |
18 | 5694994070817964255 |
19 | 62563136744290538933 |
[4,20,159,1581,16558,177149,1914605,20805629, 226837179,2478392741,27117710875,297017215757, 3255654522710,35706184176828,391779075776400, 4300227701910871,47213296523342317, 518486398180399368,5694994070817964255, 62563136744290538933] |