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| n | a(n) |
|---|---|
| 0 | 20 |
| 1 | 21 |
| 2 | 83 |
| 3 | 104 |
| 4 | 187 |
| 5 | 291 |
| 6 | 1060 |
| 7 | 1351 |
| 8 | 55100 |
| 9 | 56451 |
| 10 | 224453 |
| 11 | 280904 |
| 12 | 505357 |
| 13 | 786261 |
| 14 | 2864140 |
| 15 | 3650401 |
| 16 | 148880180 |
| 17 | 152530581 |
| 18 | 606471923 |
| 19 | 759002504 |
| 20 | 1365474427 |
| 21 | 2124476931 |
| 22 | 7738905220 |
| 23 | 9863382151 |
| 24 | 402274191260 |
| 25 | 412137573411 |
| 26 | 1638686911493 |
| 27 | 2050824484904 |
[20,21,83,104,187,291,1060,1351,55100,56451, 224453,280904,505357,786261,2864140,3650401, 148880180,152530581,606471923,759002504, 1365474427,2124476931,7738905220,9863382151, 402274191260,412137573411,1638686911493, 2050824484904] |