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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 8 |
| 3 | 8 |
| 4 | -960 |
| 5 | -24416 |
| 6 | 174976 |
| 7 | 55072384 |
| 8 | 2417174528 |
| 9 | -157596298752 |
| 10 | -36515570849792 |
| 11 | -1639992400689152 |
| 12 | 545678443552096256 |
| 13 | 129227252689536917504 |
| 14 | 760653447239073103872 |
| 15 | -6729535404906273785610240 |
| 16 | -1588610710637517290637099008 |
[0,2,8,8,-960,-24416,174976,55072384,2417174528, -157596298752,-36515570849792,-1639992400689152, 545678443552096256,129227252689536917504, 760653447239073103872,-6729535404906273785610240, -1588610710637517290637099008] |