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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 2614 |
| 3 | 587555 |
| 4 | 134229632 |
| 5 | 30679522712 |
| 6 | 7012241396116 |
| 7 | 1602748583683541 |
| 8 | 366331237082570675 |
| 9 | 83730272300093086129 |
| 10 | 19137757826895828304001 |
| 11 | 4374209764040662469308200 |
| 12 | 999788545392696494568265298 |
[15,2614,587555,134229632,30679522712, 7012241396116,1602748583683541,366331237082570675, 83730272300093086129,19137757826895828304001, 4374209764040662469308200, 999788545392696494568265298] |