| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | -3 |
| 3 | -69 |
| 4 | -3335 |
| 5 | -289801 |
| 6 | -39612939 |
| 7 | -7845054541 |
| 8 | -2125704833551 |
| 9 | -755532171928081 |
| 10 | -341044077485199379 |
| 11 | -190581499954444336725 |
| 12 | -129146418452087275163415 |
| 13 | -104328785204254369631603225 |
[1,-1,-3,-69,-3335,-289801,-39612939,-7845054541, -2125704833551,-755532171928081, -341044077485199379,-190581499954444336725, -129146418452087275163415, -104328785204254369631603225] |