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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | -1 |
| 2 | -1 |
| 3 | 67 |
| 4 | 347 |
| 5 | 1417 |
| 6 | 590267 |
| 7 | 35757697 |
| 8 | 1103996977 |
| 9 | 23018952061163 |
| 10 | 328785573754709 |
| 11 | 162948371578537 |
| 12 | 3427455470023873621 |
| 13 | 69202423313396946997 |
| 14 | 6142449451071240707 |
| 15 | 174086353362000718582994221 |
| 16 | 37938502177281712935274975819 |
| 17 | 110449470605872394476263205171 |
| 18 | 4389621268440117526955711378765711 |
[0,-1,-1,67,347,1417,590267,35757697,1103996977, 23018952061163,328785573754709,162948371578537, 3427455470023873621,69202423313396946997, 6142449451071240707,174086353362000718582994221, 37938502177281712935274975819, 110449470605872394476263205171, 4389621268440117526955711378765711] |