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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | -1 |
| 2 | 0 |
| 3 | -256 |
| 4 | 6305 |
| 5 | -384320 |
| 6 | 16392896 |
| 7 | -799337825 |
| 8 | 37023521536 |
| 9 | -1748770383360 |
| 10 | 81985167507265 |
| 11 | -3854603638194816 |
| 12 | 181029655256841600 |
| 13 | -8505521232849819841 |
| 14 | 399560845889490455040 |
| 15 | -18771170453838609544960 |
| 16 | 881839776158402870049761 |
| 17 | -41427800130507702988683200 |
| 18 | 1946222939243803281837279296 |
| 19 | -91431083130550578762727373345 |
| 20 | 4295314095871701743501398017280 |
[0,-1,0,-256,6305,-384320,16392896,-799337825, 37023521536,-1748770383360,81985167507265, -3854603638194816,181029655256841600, -8505521232849819841,399560845889490455040, -18771170453838609544960,881839776158402870049761, -41427800130507702988683200, 1946222939243803281837279296, -91431083130550578762727373345, 4295314095871701743501398017280] |