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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -6 |
| 2 | -48 |
| 3 | -300 |
| 4 | -1812 |
| 5 | -10884 |
| 6 | -65316 |
| 7 | -391908 |
| 8 | -2351460 |
| 9 | -14108772 |
| 10 | -84652644 |
| 11 | -507915876 |
| 12 | -3047495268 |
| 13 | -18284971620 |
| 14 | -109709829732 |
| 15 | -658258978404 |
| 16 | -3949553870436 |
| 17 | -23697323222628 |
| 18 | -142183939335780 |
| 19 | -853103636014692 |
[1,-6,-48,-300,-1812,-10884,-65316,-391908, -2351460,-14108772,-84652644,-507915876, -3047495268,-18284971620,-109709829732, -658258978404,-3949553870436,-23697323222628, -142183939335780,-853103636014692] |