n | a(n) |
---|---|
0 | 1 |
1 | 7 |
2 | 28 |
3 | 231 |
4 | 1813 |
5 | 13447 |
6 | 98105 |
7 | 705895 |
8 | 5044501 |
9 | 35869911 |
10 | 254229409 |
11 | 1797569767 |
12 | 12687856601 |
13 | 89436009607 |
14 | 629778626473 |
15 | 4431057410423 |
16 | 31155872769301 |
17 | 218946366105607 |
18 | 1537946178052697 |
19 | 10798953333511399 |
20 | 75802652996855281 |
21 | 531948441984119239 |
22 | 3732101910100912537 |
[1,7,28,231,1813,13447,98105,705895,5044501, 35869911,254229409,1797569767,12687856601, 89436009607,629778626473,4431057410423, 31155872769301,218946366105607,1537946178052697, 10798953333511399,75802652996855281, 531948441984119239,3732101910100912537] |