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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | -1 |
| 2 | -1 |
| 3 | -1 |
| 4 | 347 |
| 5 | -1531 |
| 6 | 590267 |
| 7 | -37723537 |
| 8 | 1103996977 |
| 9 | -2158074791 |
| 10 | 328785573754709 |
| 11 | -134852375996381 |
| 12 | 3427455470023873621 |
| 13 | -13844935285148389217 |
| 14 | 6142449451071240707 |
| 15 | -43761094586606903148089 |
| 16 | 37938502177281712935274975819 |
| 17 | -110450564689571423030247983611 |
| 18 | 4389621268440117526955711378765711 |
[0,-1,-1,-1,347,-1531,590267,-37723537,1103996977, -2158074791,328785573754709,-134852375996381, 3427455470023873621,-13844935285148389217, 6142449451071240707,-43761094586606903148089, 37938502177281712935274975819, -110450564689571423030247983611, 4389621268440117526955711378765711] |