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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 62 |
| 3 | 888 |
| 4 | 77978 |
| 5 | 1615706 |
| 6 | 163288090 |
| 7 | 3723507945 |
| 8 | 374218329866 |
| 9 | 8769044681276 |
| 10 | 883217207685508 |
| 11 | 20907867146102343 |
| 12 | 2118537576638781416 |
| 13 | 50406070688094306390 |
| 14 | 5137460901840217533830 |
| 15 | 122675738320311112349113 |
[4,62,888,77978,1615706,163288090,3723507945, 374218329866,8769044681276,883217207685508, 20907867146102343,2118537576638781416, 50406070688094306390,5137460901840217533830, 122675738320311112349113] |