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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 27 |
| 2 | 432 |
| 3 | 5193 |
| 4 | 51624 |
| 5 | 446094 |
| 6 | 3454767 |
| 7 | 24472584 |
| 8 | 160883037 |
| 9 | 992189253 |
| 10 | 5788156617 |
| 11 | 32151489435 |
| 12 | 170956128834 |
| 13 | 873959259258 |
| 14 | 4311311541669 |
| 15 | 20586621297483 |
| 16 | 95404964600448 |
| 17 | 430094901683700 |
[1,27,432,5193,51624,446094,3454767,24472584, 160883037,992189253,5788156617,32151489435, 170956128834,873959259258,4311311541669, 20586621297483,95404964600448,430094901683700] |