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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 1 |
| 4 | -231 |
| 5 | 81 |
| 6 | 55453 |
| 7 | -40431 |
| 8 | -30313231 |
| 9 | 33477985 |
| 10 | 29630916981 |
| 11 | -43713004191 |
| 12 | -45378051616631 |
| 13 | 83666428734513 |
| 14 | 100216964952070541 |
| 15 | -221570666935625999 |
| 16 | -301515678925659598623 |
| 17 | 777062158771833364929 |
| 18 | 1185517627245415533666277 |
[1,1,5,1,-231,81,55453,-40431,-30313231,33477985, 29630916981,-43713004191,-45378051616631, 83666428734513,100216964952070541, -221570666935625999,-301515678925659598623, 777062158771833364929,1185517627245415533666277] |