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| n | a(n) |
|---|---|
| 1 | 218 |
| 2 | 1888 |
| 3 | 7216 |
| 4 | 54688 |
| 5 | 400068 |
| 6 | 3369876 |
| 7 | 40265740 |
| 8 | 774250356 |
| 9 | 16204708792 |
| 10 | 401697467244 |
| 11 | 13688214787176 |
| 12 | 637511964938288 |
| 13 | 35097886281624988 |
[218,1888,7216,54688,400068,3369876,40265740, 774250356,16204708792,401697467244,13688214787176, 637511964938288,35097886281624988] |