n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 30 |
4 | 600 |
5 | 10000 |
6 | 150000 |
7 | 2100000 |
8 | 28000000 |
9 | 360000000 |
10 | 4500000000 |
11 | 55000000000 |
12 | 660000000000 |
13 | 7800000000000 |
14 | 91000000000000 |
15 | 1050000000000000 |
16 | 12000000000000000 |
17 | 136000000000000000 |
18 | 1530000000000000000 |
[0,0,1,30,600,10000,150000,2100000,28000000, 360000000,4500000000,55000000000,660000000000, 7800000000000,91000000000000,1050000000000000, 12000000000000000,136000000000000000, 1530000000000000000] |