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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | -4 |
| 3 | 16 |
| 4 | -79 |
| 5 | 498 |
| 6 | -3903 |
| 7 | 36727 |
| 8 | -403548 |
| 9 | 5071441 |
| 10 | -71752592 |
| 11 | 1128768188 |
| 12 | -19545504383 |
| 13 | 369430614902 |
| 14 | -7568453115871 |
| 15 | 167056552799575 |
| 16 | -3952337703492608 |
| 17 | 99774721152384553 |
| 18 | -2676963889524158084 |
[0,1,-4,16,-79,498,-3903,36727,-403548,5071441, -71752592,1128768188,-19545504383,369430614902, -7568453115871,167056552799575,-3952337703492608, 99774721152384553,-2676963889524158084] |