n | a(n) |
---|---|
0 | 0 |
1 | 21 |
2 | 105 |
3 | 5460 |
4 | 26796 |
5 | 1386945 |
6 | 6806205 |
7 | 352278696 |
8 | 1728749400 |
9 | 89477401965 |
10 | 439095541521 |
11 | 22726907820540 |
12 | 111528538797060 |
13 | 5772545109015321 |
14 | 28327809758911845 |
15 | 1466203730782071120 |
16 | 7195152150224811696 |
17 | 372409975073537049285 |
18 | 1827540318347343259065 |
[0,21,105,5460,26796,1386945,6806205,352278696, 1728749400,89477401965,439095541521, 22726907820540,111528538797060,5772545109015321, 28327809758911845,1466203730782071120, 7195152150224811696,372409975073537049285, 1827540318347343259065] |