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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 106 |
| 3 | 987 |
| 4 | 7689 |
| 5 | 62341 |
| 6 | 510090 |
| 7 | 3967857 |
| 8 | 29319493 |
| 9 | 208512645 |
| 10 | 1441204373 |
| 11 | 9713994355 |
| 12 | 63854007986 |
| 13 | 409453128441 |
| 14 | 2564303057258 |
| 15 | 15708490300528 |
| 16 | 94235635007292 |
| 17 | 554048642536232 |
| 18 | 3194247904837607 |
| 19 | 18067158627074107 |
[21,106,987,7689,62341,510090,3967857,29319493, 208512645,1441204373,9713994355,63854007986, 409453128441,2564303057258,15708490300528, 94235635007292,554048642536232,3194247904837607, 18067158627074107] |