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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 15 |
| 3 | 463 |
| 4 | 16372 |
| 5 | 583199 |
| 6 | 20788249 |
| 7 | 741026781 |
| 8 | 26415034787 |
| 9 | 941604528692 |
| 10 | 33564941612743 |
| 11 | 1196473967526971 |
| 12 | 42650154782713601 |
| 13 | 1520330364358307239 |
| 14 | 54194514148101568538 |
| 15 | 1931846809485041315873 |
| 16 | 68863650758427752078777 |
| 17 | 2454750745501814744040599 |
[1,15,463,16372,583199,20788249,741026781, 26415034787,941604528692,33564941612743, 1196473967526971,42650154782713601, 1520330364358307239,54194514148101568538, 1931846809485041315873,68863650758427752078777, 2454750745501814744040599] |