n | a(n) |
---|---|
2 | 1 |
3 | 4 |
4 | 15 |
5 | 420 |
6 | 3960 |
7 | 80080 |
8 | 1225224 |
9 | 19399380 |
10 | 5354228880 |
11 | 145568097675 |
12 | 7600186994400 |
13 | 254425307479200 |
14 | 9957281351799600 |
15 | 392482839950100900 |
16 | 114779426083185063200 |
17 | 5474978624167927514640 |
18 | 312603618218620377448800 |
[1,4,15,420,3960,80080,1225224,19399380, 5354228880,145568097675,7600186994400, 254425307479200,9957281351799600, 392482839950100900,114779426083185063200, 5474978624167927514640,312603618218620377448800] |