n | a(n) |
---|---|
1 | 1 |
2 | 9 |
3 | 54 |
4 | 325 |
5 | 1953 |
6 | 11718 |
7 | 70309 |
8 | 421857 |
9 | 2531142 |
10 | 15186853 |
11 | 91121121 |
12 | 546726726 |
13 | 3280360357 |
14 | 19682162145 |
15 | 118092972870 |
16 | 708557837221 |
17 | 4251347023329 |
18 | 25508082139974 |
19 | 153048492839845 |
20 | 918290957039073 |
21 | 5509745742234438 |
[1,9,54,325,1953,11718,70309,421857,2531142, 15186853,91121121,546726726,3280360357, 19682162145,118092972870,708557837221, 4251347023329,25508082139974,153048492839845, 918290957039073,5509745742234438] |