n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 5 |
3 | 42 |
4 | 544 |
5 | 10020 |
6 | 246840 |
7 | 7790160 |
8 | 305234496 |
9 | 14493790080 |
10 | 818125056000 |
11 | 54040182134400 |
12 | 4122847701941760 |
13 | 359308852504842240 |
14 | 35434445974210483200 |
15 | 3922092526740740352000 |
16 | 483768942063738966835200 |
17 | 66076388642496229027430400 |
18 | 9938208084601523840431718400 |
[1,1,5,42,544,10020,246840,7790160,305234496, 14493790080,818125056000,54040182134400, 4122847701941760,359308852504842240, 35434445974210483200,3922092526740740352000, 483768942063738966835200, 66076388642496229027430400, 9938208084601523840431718400] |