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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 972 |
| 3 | 70243 |
| 4 | 5136783 |
| 5 | 318174607 |
| 6 | 16226388113 |
| 7 | 692646032166 |
| 8 | 25325301730396 |
| 9 | 809428667338479 |
| 10 | 22988798937359989 |
| 11 | 587867998879645140 |
| 12 | 13680436324388196991 |
| 13 | 292276898997326389982 |
| 14 | 5775131297680469786518 |
[21,972,70243,5136783,318174607,16226388113, 692646032166,25325301730396,809428667338479, 22988798937359989,587867998879645140, 13680436324388196991,292276898997326389982, 5775131297680469786518] |