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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 27 |
| 4 | 432 |
| 5 | 10125 |
| 6 | 314928 |
| 7 | 12252303 |
| 8 | 573308928 |
| 9 | 31381059609 |
| 10 | 1968300000000 |
| 11 | 139234453205859 |
| 12 | 10968475320188928 |
| 13 | 952427511967417317 |
| 14 | 90388408459919044608 |
| 15 | 9308590679915771484375 |
| 16 | 1033947715493982426365952 |
| 17 | 123217926482311669202664753 |
| 18 | 15682720840457750419215679488 |
[1,3,27,432,10125,314928,12252303,573308928, 31381059609,1968300000000,139234453205859, 10968475320188928,952427511967417317, 90388408459919044608,9308590679915771484375, 1033947715493982426365952, 123217926482311669202664753, 15682720840457750419215679488] |