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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | -1 |
| 3 | -9 |
| 4 | 96 |
| 5 | 1250 |
| 6 | -19440 |
| 7 | -352947 |
| 8 | 7340032 |
| 9 | 172186884 |
| 10 | -4500000000 |
| 11 | -129687123005 |
| 12 | 4086546038784 |
| 13 | 139788510734886 |
| 14 | -5159146026151936 |
| 15 | -204350482177734375 |
| 16 | 8646911284551352320 |
| 17 | 389289535005334947848 |
| 18 | -18580248257778920521728 |
[0,-1,-9,96,1250,-19440,-352947,7340032,172186884, -4500000000,-129687123005,4086546038784, 139788510734886,-5159146026151936, -204350482177734375,8646911284551352320, 389289535005334947848,-18580248257778920521728] |