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| n | a(n) |
|---|---|
| 1 | 921 |
| 2 | 1311 |
| 3 | 2109 |
| 4 | 3759 |
| 5 | 7221 |
| 6 | 14631 |
| 7 | 30909 |
| 8 | 67839 |
| 9 | 154821 |
| 10 | 368151 |
| 11 | 912909 |
| 12 | 2356719 |
| 13 | 6307221 |
| 14 | 17396871 |
| 15 | 49142109 |
| 16 | 141330399 |
| 17 | 411800421 |
| 18 | 1211020791 |
| 19 | 3584302509 |
| 20 | 10655388879 |
| 21 | 31771130421 |
| 22 | 94923319911 |
| 23 | 283989818109 |
| 24 | 850409172159 |
[921,1311,2109,3759,7221,14631,30909,67839,154821, 368151,912909,2356719,6307221,17396871,49142109, 141330399,411800421,1211020791,3584302509, 10655388879,31771130421,94923319911,283989818109, 850409172159] |