n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 21 |
3 | 740 |
4 | 37310 |
5 | 2460024 |
6 | 200770416 |
7 | 19551774528 |
8 | 2213488134000 |
9 | 285711909912000 |
10 | 41419784380740480 |
11 | 6663725042739448320 |
12 | 1178209566488368028160 |
13 | 227096910697908706560000 |
[0,1,21,740,37310,2460024,200770416,19551774528, 2213488134000,285711909912000,41419784380740480, 6663725042739448320,1178209566488368028160, 227096910697908706560000] |