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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 203 |
| 3 | 129 |
| 4 | 2466 |
| 5 | 30072 |
| 6 | 153289 |
| 7 | 1841903 |
| 8 | 19059670 |
| 9 | 151628931 |
| 10 | 1608282486 |
| 11 | 15916306276 |
| 12 | 144533905546 |
| 13 | 1451676564506 |
| 14 | 14214967754822 |
| 15 | 134895783401363 |
| 16 | 1327924864310213 |
| 17 | 12957080978763668 |
| 18 | 124947115339353318 |
[21,203,129,2466,30072,153289,1841903,19059670, 151628931,1608282486,15916306276,144533905546, 1451676564506,14214967754822,134895783401363, 1327924864310213,12957080978763668, 124947115339353318] |