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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 27 |
| 2 | 223 |
| 3 | 1467 |
| 4 | 11303 |
| 5 | 88377 |
| 6 | 707923 |
| 7 | 5747433 |
| 8 | 47168039 |
| 9 | 390278007 |
| 10 | 3250471333 |
| 11 | 27216501185 |
| 12 | 228895105331 |
| 13 | 1932205156259 |
| 14 | 16362201900939 |
| 15 | 138934036864707 |
| 16 | 1182486246555079 |
| 17 | 10084940483186669 |
| 18 | 86164966628165665 |
[1,27,223,1467,11303,88377,707923,5747433, 47168039,390278007,3250471333,27216501185, 228895105331,1932205156259,16362201900939, 138934036864707,1182486246555079, 10084940483186669,86164966628165665] |