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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 27 |
| 3 | 351 |
| 4 | 6075 |
| 5 | 131463 |
| 6 | 3413907 |
| 7 | 103429791 |
| 8 | 3581223435 |
| 9 | 139498558263 |
| 10 | 6037616347587 |
| 11 | 287444492409231 |
| 12 | 14929010774254395 |
| 13 | 839982382565841063 |
| 14 | 50897213545996785267 |
| 15 | 3304312091004451756671 |
| 16 | 228821504027595115886955 |
| 17 | 16836102104577636004291863 |
| 18 | 1311625494765417347634022947 |
[1,3,27,351,6075,131463,3413907,103429791, 3581223435,139498558263,6037616347587, 287444492409231,14929010774254395, 839982382565841063,50897213545996785267, 3304312091004451756671,228821504027595115886955, 16836102104577636004291863, 1311625494765417347634022947] |