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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 27 |
| 3 | 400 |
| 4 | 5741 |
| 5 | 81910 |
| 6 | 1165913 |
| 7 | 16583044 |
| 8 | 235810525 |
| 9 | 3352967744 |
| 10 | 47674475534 |
| 11 | 677859111916 |
| 12 | 9638113778155 |
| 13 | 137039061732784 |
| 14 | 1948482984616486 |
| 15 | 27704405262039888 |
| 16 | 393913655872817605 |
| 17 | 5600840943900558440 |
[2,27,400,5741,81910,1165913,16583044,235810525, 3352967744,47674475534,677859111916,9638113778155, 137039061732784,1948482984616486, 27704405262039888,393913655872817605, 5600840943900558440] |