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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 412 |
| 3 | 3309 |
| 4 | 6170 |
| 5 | 28173 |
| 6 | 363650 |
| 7 | 995263 |
| 8 | 7017397 |
| 9 | 125707566 |
| 10 | 496907299 |
| 11 | 5084773943 |
| 12 | 131364083278 |
| 13 | 749724226722 |
| 14 | 10945594000512 |
| 15 | 414717014027555 |
| 16 | 3429998068477278 |
| 17 | 72977331677447737 |
| 18 | 3992874305065142952 |
[1,2,412,3309,6170,28173,363650,995263,7017397, 125707566,496907299,5084773943,131364083278, 749724226722,10945594000512,414717014027555, 3429998068477278,72977331677447737, 3992874305065142952] |