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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 5 |
| 3 | -29 |
| 4 | 270 |
| 5 | -3233 |
| 6 | 47800 |
| 7 | -838561 |
| 8 | 17013991 |
| 9 | -391779640 |
| 10 | 10091836632 |
| 11 | -287491284748 |
| 12 | 8973657413421 |
| 13 | -304549220113387 |
| 14 | 11165193890312790 |
| 15 | -439726629957500944 |
| 16 | 18514829984975265703 |
| 17 | -829953080825411342745 |
| 18 | 39461813340364709540008 |
[1,-1,5,-29,270,-3233,47800,-838561,17013991, -391779640,10091836632,-287491284748, 8973657413421,-304549220113387,11165193890312790, -439726629957500944,18514829984975265703, -829953080825411342745,39461813340364709540008] |