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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 90 |
| 3 | 2535 |
| 4 | 93840 |
| 5 | 4226355 |
| 6 | 222038775 |
| 7 | 13259599965 |
| 8 | 884588496165 |
| 9 | 65114097133590 |
| 10 | 5239173990133060 |
| 11 | 457392343670390700 |
| 12 | 43064135370809341250 |
| 13 | 4350264113638902544555 |
| 14 | 469422682906897831519170 |
| 15 | 53897717818214315584719430 |
| 16 | 6561919113715122121302125775 |
[1,5,90,2535,93840,4226355,222038775,13259599965, 884588496165,65114097133590,5239173990133060, 457392343670390700,43064135370809341250, 4350264113638902544555,469422682906897831519170, 53897717818214315584719430, 6561919113715122121302125775] |