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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 171 |
| 3 | 3304 |
| 4 | 36456 |
| 5 | 193028 |
| 6 | 198629 |
| 7 | 64044140 |
| 8 | 3209176272 |
| 9 | 2089963197 |
| 10 | 14714161192 |
| 11 | 151173075361 |
| 12 | 450458512764 |
| 13 | 1490895165780 |
| 14 | 4767682119956876 |
| 15 | 19409457907183648 |
| 16 | 293100434264580753 |
| 17 | 818944253254104320 |
| 18 | 19191303984466705047 |
[4,171,3304,36456,193028,198629,64044140, 3209176272,2089963197,14714161192,151173075361, 450458512764,1490895165780,4767682119956876, 19409457907183648,293100434264580753, 818944253254104320,19191303984466705047] |