n | a(n) |
---|---|
4 | 9 |
5 | 30 |
6 | 180 |
7 | 980 |
8 | 8326 |
9 | 70272 |
10 | 695690 |
11 | 7518720 |
12 | 89193276 |
13 | 1148241458 |
14 | 15947668065 |
15 | 237613988040 |
16 | 3780133322620 |
17 | 63945806121448 |
18 | 1146081593303784 |
19 | 21693271558730304 |
20 | 432411684714253605 |
21 | 9053476937543082240 |
22 | 198641103956454088919 |
[9,30,180,980,8326,70272,695690,7518720,89193276, 1148241458,15947668065,237613988040,3780133322620, 63945806121448,1146081593303784,21693271558730304, 432411684714253605,9053476937543082240, 198641103956454088919] |