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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 11 |
| 3 | 63 |
| 4 | 489 |
| 5 | 4785 |
| 6 | 56475 |
| 7 | 780255 |
| 8 | 12348945 |
| 9 | 220253985 |
| 10 | 4370620275 |
| 11 | 95498916975 |
| 12 | 2278224696825 |
| 13 | 58917607974225 |
| 14 | 1641787169697675 |
| 15 | 49040157044253375 |
| 16 | 1563094742062478625 |
| 17 | 52953322446161762625 |
| 18 | 1899986948191060603875 |
| 19 | 71977860935783603175375 |
| 20 | 2870913642898706235455625 |
[3,11,63,489,4785,56475,780255,12348945,220253985, 4370620275,95498916975,2278224696825, 58917607974225,1641787169697675,49040157044253375, 1563094742062478625,52953322446161762625, 1899986948191060603875,71977860935783603175375, 2870913642898706235455625] |