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| n | a(n) |
|---|---|
| 2 | 0 |
| 3 | -1 |
| 4 | 0 |
| 5 | 0 |
| 6 | -8 |
| 7 | -72 |
| 8 | 0 |
| 9 | 0 |
| 10 | -2061248 |
| 11 | 0 |
| 12 | -18150912 |
| 13 | 2581719040 |
| 14 | 0 |
| 15 | 0 |
| 16 | 6237406973952 |
| 17 | 0 |
| 18 | 311692729699401728 |
| 19 | 0 |
| 20 | 0 |
| 21 | 2675112340760315428864 |
| 22 | 0 |
| 23 | 0 |
| 24 | -149670892669766097645487521792 |
| 25 | 162894623351898578070944297779200 |
| 26 | 273248864699809403831952842162176 |
| 27 | 0 |
| 28 | 0 |
| 29 | -13518055482368485085619549462056665088 |
| 30 | 4364947372586985974930810143672643878912 |
[0,-1,0,0,-8,-72,0,0,-2061248,0,-18150912, 2581719040,0,0,6237406973952,0,311692729699401728, 0,0,2675112340760315428864,0,0, -149670892669766097645487521792, 162894623351898578070944297779200, 273248864699809403831952842162176,0,0, -13518055482368485085619549462056665088, 4364947372586985974930810143672643878912] |