n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 9 |
3 | 60 |
4 | 490 |
5 | 4534 |
6 | 45689 |
7 | 489920 |
8 | 5508000 |
9 | 64276492 |
10 | 773029466 |
11 | 9531003552 |
12 | 119990158054 |
13 | 1537695160070 |
14 | 20009930706137 |
15 | 263883333450760 |
16 | 3521003563829212 |
17 | 47470845904561648 |
18 | 645960472314074400 |
[1,2,9,60,490,4534,45689,489920,5508000,64276492, 773029466,9531003552,119990158054,1537695160070, 20009930706137,263883333450760,3521003563829212, 47470845904561648,645960472314074400] |