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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | -15 |
| 3 | -201 |
| 4 | 1025 |
| 5 | 505199 |
| 6 | 45962865 |
| 7 | 672778599 |
| 8 | -885967354495 |
| 9 | -245542561428001 |
| 10 | -22172563647911055 |
| 11 | 14487811265589717399 |
| 12 | 9628380148436165613185 |
| 13 | 2365618724494349248126799 |
[1,-1,-15,-201,1025,505199,45962865,672778599, -885967354495,-245542561428001,-22172563647911055, 14487811265589717399,9628380148436165613185, 2365618724494349248126799] |