n | a(n) |
---|---|
1 | 1 |
2 | 5 |
3 | 40 |
4 | 440 |
5 | 6160 |
6 | 104720 |
7 | 2094400 |
8 | 48171200 |
9 | 1252451200 |
10 | 36321084800 |
11 | 1162274713600 |
12 | 40679614976000 |
13 | 1545825369088000 |
14 | 63378840132608000 |
15 | 2788668965834752000 |
16 | 131067441394233344000 |
17 | 6553372069711667200000 |
18 | 347328719694718361600000 |
19 | 19450408302904228249600000 |
[1,5,40,440,6160,104720,2094400,48171200, 1252451200,36321084800,1162274713600, 40679614976000,1545825369088000,63378840132608000, 2788668965834752000,131067441394233344000, 6553372069711667200000,347328719694718361600000, 19450408302904228249600000] |