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| n | a(n) |
|---|---|
| 0 | -1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 10 |
| 4 | 231 |
| 5 | 9576 |
| 6 | 623645 |
| 7 | 58715280 |
| 8 | 7547514975 |
| 9 | 1270453824640 |
| 10 | 271252029133449 |
| 11 | 71635824470246400 |
| 12 | 22929813173612997575 |
| 13 | 8747686347650933760000 |
| 14 | 3921812703436118765113125 |
| 15 | 2041590849971133677650610176 |
| 16 | 1221367737152989777782325269375 |
| 17 | 832163138229382457228044554240000 |
[-1,1,1,10,231,9576,623645,58715280,7547514975, 1270453824640,271252029133449,71635824470246400, 22929813173612997575,8747686347650933760000, 3921812703436118765113125, 2041590849971133677650610176, 1221367737152989777782325269375, 832163138229382457228044554240000] |