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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 45 |
| 3 | 105 |
| 4 | 17325 |
| 5 | 189189 |
| 6 | 1072071 |
| 7 | 6235515 |
| 8 | 4732755885 |
| 9 | 56968357875 |
| 10 | 1387749197835 |
| 11 | 1066617152055 |
| 12 | 211545735157575 |
| 13 | 2639940564777075 |
| 14 | 33133947904855125 |
| 15 | 208964764786619655 |
| 16 | 677672732203007541165 |
| 17 | 8617464674207794857375 |
| 18 | 219904931871450765064125 |
| 19 | 703573951001456048889375 |
| 20 | 144457803619618955957966475 |
[1,3,45,105,17325,189189,1072071,6235515, 4732755885,56968357875,1387749197835, 1066617152055,211545735157575,2639940564777075, 33133947904855125,208964764786619655, 677672732203007541165,8617464674207794857375, 219904931871450765064125,703573951001456048889375, 144457803619618955957966475] |