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| n | a(n) |
|---|---|
| 1 | -1 |
| 2 | 1 |
| 3 | 31 |
| 4 | 417 |
| 5 | 5919 |
| 6 | 97217 |
| 7 | 1828479 |
| 8 | 38085249 |
| 9 | 853450367 |
| 10 | 20174707521 |
| 11 | 496690317855 |
| 12 | 12626836592289 |
| 13 | 329476040177439 |
| 14 | 8785359461936769 |
| 15 | 238587766484265471 |
| 16 | 6581966817521388033 |
| 17 | 184067922884292651519 |
| 18 | 5209333642085984431489 |
| 19 | 148992465188631205367071 |
| 20 | 4301514890878664802287777 |
[-1,1,31,417,5919,97217,1828479,38085249, 853450367,20174707521,496690317855,12626836592289, 329476040177439,8785359461936769, 238587766484265471,6581966817521388033, 184067922884292651519,5209333642085984431489, 148992465188631205367071, 4301514890878664802287777] |