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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | -12 |
| 2 | -16 |
| 3 | -294 |
| 4 | -1552 |
| 5 | -11868 |
| 6 | -78142 |
| 7 | -543996 |
| 8 | -3706624 |
| 9 | -25463142 |
| 10 | -174376288 |
| 11 | -1195587372 |
| 12 | -8193644926 |
| 13 | -56162781804 |
| 14 | -384938354032 |
| 15 | -2638425262758 |
| 16 | -18083987259952 |
| 17 | -123949619666556 |
| 18 | -849562999302334 |
| 19 | -5822992294650972 |
| 20 | -39911380656754528 |
[2,-12,-16,-294,-1552,-11868,-78142,-543996, -3706624,-25463142,-174376288,-1195587372, -8193644926,-56162781804,-384938354032, -2638425262758,-18083987259952,-123949619666556, -849562999302334,-5822992294650972, -39911380656754528] |