n | a(n) |
---|---|
0 | 1 |
1 | 20 |
2 | 360 |
3 | 6460 |
4 | 115920 |
5 | 2080100 |
6 | 37325880 |
7 | 669785740 |
8 | 12018817440 |
9 | 215668928180 |
10 | 3870021889800 |
11 | 69444725088220 |
12 | 1246135029698160 |
13 | 22360985809478660 |
14 | 401251609540917720 |
15 | 7200167985927040300 |
[1,20,360,6460,115920,2080100,37325880,669785740, 12018817440,215668928180,3870021889800, 69444725088220,1246135029698160,22360985809478660, 401251609540917720,7200167985927040300] |