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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 27 |
| 3 | 387 |
| 4 | 7659 |
| 5 | 193491 |
| 6 | 5948091 |
| 7 | 215446563 |
| 8 | 8984708235 |
| 9 | 423944899443 |
| 10 | 22328393101659 |
| 11 | 1298429924941251 |
| 12 | 82625791930962219 |
| 13 | 5711012035686681363 |
| 14 | 426058604580805219323 |
| 15 | 34121803137713388036963 |
| 16 | 2919847869159667841599947 |
| 17 | 265868538017899566748612275 |
[1,3,27,387,7659,193491,5948091,215446563, 8984708235,423944899443,22328393101659, 1298429924941251,82625791930962219, 5711012035686681363,426058604580805219323, 34121803137713388036963,2919847869159667841599947, 265868538017899566748612275] |