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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | -3 |
| 5 | 6 |
| 6 | -18 |
| 7 | 48 |
| 8 | -195 |
| 9 | 549 |
| 10 | -3465 |
| 11 | 7452 |
| 12 | -112707 |
| 13 | -5994 |
| 14 | -6866904 |
| 15 | -25659292 |
| 16 | -700243362 |
| 17 | -5594278734 |
| 18 | -106900155574 |
| 19 | -1284177510456 |
| 20 | -22692117042216 |
| 21 | -348993455353854 |
| 22 | -6343625959542180 |
| 23 | -114598750263323292 |
| 24 | -2239367384128230334 |
| 25 | -45442026505346961480 |
| 26 | -967951044447512385336 |
[1,-3,6,-18,48,-195,549,-3465,7452,-112707,-5994, -6866904,-25659292,-700243362,-5594278734, -106900155574,-1284177510456,-22692117042216, -348993455353854,-6343625959542180, -114598750263323292,-2239367384128230334, -45442026505346961480,-967951044447512385336] |