n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 4 |
3 | 56 |
4 | 560 |
5 | 4960 |
6 | 41664 |
7 | 341376 |
8 | 2763520 |
9 | 22238720 |
10 | 178433024 |
11 | 1429559296 |
12 | 11444858880 |
13 | 91592417280 |
14 | 732873539584 |
15 | 5863525154816 |
16 | 46910348656640 |
17 | 375291379056640 |
18 | 3002365391929344 |
19 | 24019060573863936 |
20 | 192153034345676800 |
21 | 1537226473786572800 |
[0,0,4,56,560,4960,41664,341376,2763520,22238720, 178433024,1429559296,11444858880,91592417280, 732873539584,5863525154816,46910348656640, 375291379056640,3002365391929344, 24019060573863936,192153034345676800, 1537226473786572800] |