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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3281 |
| 3 | 25126 |
| 4 | 6845526 |
| 5 | 121368902 |
| 6 | 12805025677 |
| 7 | 373879862237 |
| 8 | 24707348223677 |
| 9 | 948781359159752 |
| 10 | 50702478932197928 |
| 11 | 2210812262034197128 |
| 12 | 108528095366637700218 |
| 13 | 4974402150387759436378 |
| 14 | 236926456045384849970778 |
| 15 | 11047772769135934828000404 |
[1,1,3281,25126,6845526,121368902,12805025677, 373879862237,24707348223677,948781359159752, 50702478932197928,2210812262034197128, 108528095366637700218,4974402150387759436378, 236926456045384849970778, 11047772769135934828000404] |