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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 91 |
| 3 | 187 |
| 4 | 391 |
| 5 | 3451 |
| 6 | 4147 |
| 7 | 6391 |
| 8 | 7579 |
| 9 | 8827 |
| 10 | 9499 |
| 11 | 9823 |
| 12 | 11803 |
| 13 | 15283 |
| 14 | 21307 |
| 15 | 22243 |
| 16 | 26887 |
| 17 | 29563 |
| 18 | 36091 |
| 19 | 42763 |
| 20 | 49387 |
| 21 | 62491 |
| 22 | 63427 |
| 23 | 84091 |
| 24 | 89947 |
| 25 | 107707 |
| 26 | 116083 |
| 27 | 126451 |
| 28 | 139867 |
| 29 | 155227 |
| 30 | 227263 |
| 31 | 270391 |
| 32 | 287419 |
| 33 | 302731 |
| 34 | 317191 |
| 35 | 320827 |
| 36 | 376987 |
| 37 | 381667 |
| 38 | 433939 |
[21,91,187,391,3451,4147,6391,7579,8827,9499,9823, 11803,15283,21307,22243,26887,29563,36091,42763, 49387,62491,63427,84091,89947,107707,116083, 126451,139867,155227,227263,270391,287419,302731, 317191,320827,376987,381667,433939] |