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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | -4 |
| 3 | 52 |
| 4 | -1252 |
| 5 | 47380 |
| 6 | -2589892 |
| 7 | 193480948 |
| 8 | -18967658404 |
| 9 | 2364328255444 |
| 10 | -365398042310020 |
| 11 | 68588722144816564 |
| 12 | -15372942045464127076 |
| 13 | 4055513943597589455508 |
| 14 | -1243968998818298201100868 |
| 15 | 439009056263271003371155060 |
| 16 | -176627099114433045240563153188 |
| 17 | 80365037678138695452520237597012 |
| 18 | -41059325231828016124174743746157316 |
[1,1,-4,52,-1252,47380,-2589892,193480948, -18967658404,2364328255444,-365398042310020, 68588722144816564,-15372942045464127076, 4055513943597589455508,-1243968998818298201100868, 439009056263271003371155060, -176627099114433045240563153188, 80365037678138695452520237597012, -41059325231828016124174743746157316] |