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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 990 |
| 3 | 65675610 |
| 4 | 292254818279490 |
| 5 | 87238205544516133249890 |
| 6 | 1746783780641161331912282302353810 |
| 7 | 2346167125778415534349931707837063900925570370 |
| 8 | 211381076411597878243848286563025939634200193105055412862370 |
[1,990,65675610,292254818279490, 87238205544516133249890, 1746783780641161331912282302353810, 2346167125778415534349931707837063900925570370, 21138107641159787824384828656302593963420019310505\ 5412862370] |