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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | -1 |
| 2 | -2 |
| 3 | -1 |
| 4 | 148 |
| 5 | 7499 |
| 6 | 435898 |
| 7 | 32241299 |
| 8 | 3034190248 |
| 9 | 357512009399 |
| 10 | 51798976006198 |
| 11 | 9074564088169799 |
| 12 | 1893681694795266748 |
| 13 | 464586802573524130499 |
| 14 | 132469958743645663494898 |
| 15 | 43458963744363238693849499 |
| 16 | 16258850448552441418587853648 |
| 17 | 6882131151536073693976060834799 |
| 18 | 3272832457519325432770128200645998 |
[0,-1,-2,-1,148,7499,435898,32241299,3034190248, 357512009399,51798976006198,9074564088169799, 1893681694795266748,464586802573524130499, 132469958743645663494898, 43458963744363238693849499, 16258850448552441418587853648, 6882131151536073693976060834799, 3272832457519325432770128200645998] |