n | a(n) |
---|---|
0 | 1 |
1 | 21 |
2 | 420 |
3 | 8190 |
4 | 159600 |
5 | 3108210 |
6 | 60532290 |
7 | 1178845500 |
8 | 22957618110 |
9 | 447091673490 |
10 | 8706955895400 |
11 | 169564956368010 |
12 | 3302218915041690 |
13 | 64309571936658300 |
14 | 1252406684472377910 |
15 | 24390187277913766890 |
[1,21,420,8190,159600,3108210,60532290,1178845500, 22957618110,447091673490,8706955895400, 169564956368010,3302218915041690, 64309571936658300,1252406684472377910, 24390187277913766890] |