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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 146 |
| 3 | 760 |
| 4 | 6110 |
| 5 | 42367 |
| 6 | 316977 |
| 7 | 2320879 |
| 8 | 17037458 |
| 9 | 125456575 |
| 10 | 920577056 |
| 11 | 6771994976 |
| 12 | 49750520267 |
| 13 | 365694010435 |
| 14 | 2687564829667 |
| 15 | 19752736970617 |
| 16 | 145173898526499 |
| 17 | 1066965083553746 |
| 18 | 7841771608569736 |
| 19 | 57633622628200420 |
[3,146,760,6110,42367,316977,2320879,17037458, 125456575,920577056,6771994976,49750520267, 365694010435,2687564829667,19752736970617, 145173898526499,1066965083553746,7841771608569736, 57633622628200420] |