The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 1 |
| 2 | 2 |
| 3 | -2 |
| 4 | 20 |
| 5 | -190 |
| 6 | 3240 |
| 7 | -90800 |
| 8 | 4174920 |
| 9 | -313173840 |
| 10 | 38204662320 |
| 11 | -7564715117520 |
| 12 | 2428250059593600 |
| 13 | -1262694691720176000 |
| 14 | 1063187432567808662400 |
| 15 | -1449125250052431355430400 |
| 16 | 3196769645011428154428883200 |
| 17 | -11412468527893653264760022630400 |
[2,1,2,-2,20,-190,3240,-90800,4174920,-313173840, 38204662320,-7564715117520,2428250059593600, -1262694691720176000,1063187432567808662400, -1449125250052431355430400, 3196769645011428154428883200, -11412468527893653264760022630400] |