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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 22 |
| 3 | 309 |
| 4 | 5428 |
| 5 | 115155 |
| 6 | 2869242 |
| 7 | 82187658 |
| 8 | 2661876168 |
| 9 | 96202473183 |
| 10 | 3838516103310 |
| 11 | 167606767714397 |
| 12 | 7949901069639228 |
| 13 | 407048805012563038 |
| 14 | 22376916254447538882 |
| 15 | 1314573505901491675965 |
| 16 | 82188946843192555474704 |
| 17 | 5448870914168179374456623 |
| 18 | 381819805747937892412056342 |
[2,22,309,5428,115155,2869242,82187658,2661876168, 96202473183,3838516103310,167606767714397, 7949901069639228,407048805012563038, 22376916254447538882,1314573505901491675965, 82188946843192555474704,5448870914168179374456623, 381819805747937892412056342] |