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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 842090474940 |
| 3 | 9561215418596022668009737500 |
| 4 | 41499275921837441873503310658937755719615400000 |
| 5 | 15806556884633733578544972910460376919497070823113887278535399000000 |
[1,842090474940,9561215418596022668009737500, 41499275921837441873503310658937755719615400000, 15806556884633733578544972910460376919497070823113\ 887278535399000000] |