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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 11 |
| 3 | 22 |
| 4 | 31 |
| 5 | 52 |
| 6 | 56 |
| 7 | 59 |
| 8 | 67 |
| 9 | 88 |
| 10 | 104 |
| 11 | 251 |
| 12 | 572 |
| 13 | 724 |
| 14 | 1379 |
| 15 | 2696 |
| 16 | 3616 |
| 17 | 3928 |
| 18 | 8518 |
| 19 | 9239 |
| 20 | 9419 |
| 21 | 10547 |
| 22 | 20396 |
| 23 | 42136 |
| 24 | 43936 |
| 25 | 69422 |
| 26 | 313127 |
| 27 | 330275 |
| 28 | 358568 |
| 29 | 411974 |
[4,11,22,31,52,56,59,67,88,104,251,572,724,1379, 2696,3616,3928,8518,9239,9419,10547,20396,42136, 43936,69422,313127,330275,358568,411974] |