n | a(n) |
---|---|
0 | -1 |
1 | 2 |
2 | 10 |
3 | 84 |
4 | 858 |
5 | 9724 |
6 | 117572 |
7 | 1485800 |
8 | 19389690 |
9 | 259289580 |
10 | 3534526380 |
11 | 48932534040 |
12 | 686119227300 |
13 | 9723892802904 |
14 | 139067101832008 |
15 | 2004484433302736 |
16 | 29089272078453818 |
17 | 424672260824486220 |
18 | 6232570989814602524 |
19 | 91901608649243484728 |
20 | 1360850743459951600780 |
[-1,2,10,84,858,9724,117572,1485800,19389690, 259289580,3534526380,48932534040,686119227300, 9723892802904,139067101832008,2004484433302736, 29089272078453818,424672260824486220, 6232570989814602524,91901608649243484728, 1360850743459951600780] |