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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 20 |
| 3 | 295 |
| 4 | 3485 |
| 5 | 33496 |
| 6 | 247799 |
| 7 | 1010905 |
| 8 | -7422100 |
| 9 | -238118825 |
| 10 | -3513857515 |
| 11 | -38530770320 |
| 12 | -329008652665 |
| 13 | -1926925302575 |
| 14 | -594574697500 |
| 15 | 188633380315975 |
| 16 | 3451130126965325 |
| 17 | 42502627523897800 |
| 18 | 406764806549554775 |
| 19 | 2912899847916711625 |
[1,20,295,3485,33496,247799,1010905,-7422100, -238118825,-3513857515,-38530770320,-329008652665, -1926925302575,-594574697500,188633380315975, 3451130126965325,42502627523897800, 406764806549554775,2912899847916711625] |