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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | -120 |
| 2 | 30240 |
| 3 | -17297280 |
| 4 | 17643225600 |
| 5 | -28158588057600 |
| 6 | 64764752532480000 |
| 7 | -202843204931727360000 |
| 8 | 830034394580628357120000 |
| 9 | -4299578163927654889881600000 |
| 10 | 27500101936481280675682713600000 |
[2,-120,30240,-17297280,17643225600, -28158588057600,64764752532480000, -202843204931727360000,830034394580628357120000, -4299578163927654889881600000, 27500101936481280675682713600000] |