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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 1 |
| 3 | -45 |
| 4 | -159 |
| 5 | 963 |
| 6 | 9249 |
| 7 | -18477 |
| 8 | -573375 |
| 9 | -537597 |
| 10 | 39670209 |
| 11 | 162018387 |
| 12 | -3004923231 |
| 13 | -24568534845 |
| 14 | 238806411489 |
| 15 | 3468095137107 |
| 16 | -18252483967359 |
| 17 | -498673629451773 |
| 18 | 986316931205505 |
| 19 | 74767953434671827 |
| 20 | 74383686760778721 |
| 21 | -11739721489265156157 |
[1,3,1,-45,-159,963,9249,-18477,-573375,-537597, 39670209,162018387,-3004923231,-24568534845, 238806411489,3468095137107,-18252483967359, -498673629451773,986316931205505, 74767953434671827,74383686760778721, -11739721489265156157] |