The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | -1 |
| 1 | 4 |
| 2 | 92 |
| 3 | 784 |
| 4 | -3856 |
| 5 | 33856 |
| 6 | 96704 |
| 7 | 73984 |
| 8 | -418048 |
| 9 | 59474944 |
| 10 | -101917696 |
| 11 | 443355136 |
| 12 | 6249181184 |
| 13 | 37406654464 |
| 14 | -217868812288 |
| 15 | 2345945595904 |
| 16 | 4101714673664 |
| 17 | 699056521216 |
| 18 | 52661959000064 |
| 19 | 3420344569298944 |
| 20 | -8264891921072128 |
| 21 | 41548867031793664 |
[-1,4,92,784,-3856,33856,96704,73984,-418048, 59474944,-101917696,443355136,6249181184, 37406654464,-217868812288,2345945595904, 4101714673664,699056521216,52661959000064, 3420344569298944,-8264891921072128, 41548867031793664] |