n | a(n) |
---|---|
0 | 1 |
1 | 84 |
2 | 2520 |
3 | 41580 |
4 | 457380 |
5 | 3737448 |
6 | 24293412 |
7 | 131589315 |
8 | 614083470 |
9 | 2530768240 |
10 | 9386849472 |
11 | 31803696288 |
12 | 99604982880 |
13 | 291153026880 |
14 | 800670823920 |
15 | 2085276513474 |
16 | 5172303508911 |
17 | 12276881393700 |
18 | 27999904933000 |
19 | 61578738292500 |
20 | 130994770549500 |
21 | 270273795363000 |
[1,84,2520,41580,457380,3737448,24293412, 131589315,614083470,2530768240,9386849472, 31803696288,99604982880,291153026880,800670823920, 2085276513474,5172303508911,12276881393700, 27999904933000,61578738292500,130994770549500, 270273795363000] |