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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 27 |
| 3 | 352 |
| 4 | 5529 |
| 5 | 97092 |
| 6 | 1835873 |
| 7 | 36585987 |
| 8 | 758230146 |
| 9 | 16197642704 |
| 10 | 354473912751 |
| 11 | 7911445710438 |
| 12 | 179479850071287 |
| 13 | 4128118899341085 |
| 14 | 96071630789136060 |
| 15 | 2258659897520722978 |
| 16 | 53574405946963574691 |
| 17 | 1280717656016739805269 |
| 18 | 30828724750464602060491 |
| 19 | 746692595857870177801332 |
[1,3,27,352,5529,97092,1835873,36585987,758230146, 16197642704,354473912751,7911445710438, 179479850071287,4128118899341085, 96071630789136060,2258659897520722978, 53574405946963574691,1280717656016739805269, 30828724750464602060491,746692595857870177801332] |