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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 20 |
| 2 | 1190 |
| 3 | 449540 |
| 4 | 1094267450 |
| 5 | 17283181758500 |
| 6 | 1774660248586902950 |
| 7 | 1182579046508766038251700 |
| 8 | 5134581376819479940742838299450 |
| 9 | 144547890423248529154421336209389168500 |
| 10 | 26527720524980501045637796065988864058001683750 |
| 11 | 31574745853363739268697794406696294745967395732336262500 |
[2,20,1190,449540,1094267450,17283181758500, 1774660248586902950,1182579046508766038251700, 5134581376819479940742838299450, 144547890423248529154421336209389168500, 26527720524980501045637796065988864058001683750, 31574745853363739268697794406696294745967395732336\ 262500] |