n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 6 |
5 | 45 |
6 | 435 |
7 | 5250 |
8 | 76608 |
9 | 1316574 |
10 | 26100000 |
11 | 587030895 |
12 | 14780620800 |
13 | 412069511139 |
14 | 12604714327296 |
15 | 419801484375000 |
16 | 15123782440058880 |
17 | 586049426860524300 |
18 | 24307340986526810112 |
19 | 1074495780444130114509 |
20 | 50429952000000000000000 |
[0,0,1,6,45,435,5250,76608,1316574,26100000, 587030895,14780620800,412069511139,12604714327296, 419801484375000,15123782440058880, 586049426860524300,24307340986526810112, 1074495780444130114509,50429952000000000000000] |