n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 20 |
3 | 410 |
4 | 8600 |
5 | 184200 |
6 | 4020000 |
7 | 89205000 |
8 | 2008700000 |
9 | 45816140000 |
10 | 1056825200000 |
11 | 24618524200000 |
12 | 578457724000000 |
13 | 13695679012000000 |
14 | 326448619920000000 |
15 | 7827776361090000000 |
16 | 188701194087000000000 |
[1,1,20,410,8600,184200,4020000,89205000, 2008700000,45816140000,1056825200000, 24618524200000,578457724000000,13695679012000000, 326448619920000000,7827776361090000000, 188701194087000000000] |