n | a(n) |
---|---|
0 | 1 |
1 | 9 |
2 | 57 |
3 | 312 |
4 | 1578 |
5 | 7599 |
6 | 35401 |
7 | 161052 |
8 | 719790 |
9 | 3173090 |
10 | 13836426 |
11 | 59803104 |
12 | 256596276 |
13 | 1094249019 |
14 | 4642178601 |
15 | 19605872724 |
16 | 82483419846 |
17 | 345839048094 |
18 | 1445715336366 |
19 | 6027524015664 |
20 | 25070662980876 |
21 | 104056307673654 |
[1,9,57,312,1578,7599,35401,161052,719790,3173090, 13836426,59803104,256596276,1094249019,4642178601, 19605872724,82483419846,345839048094, 1445715336366,6027524015664,25070662980876, 104056307673654] |