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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 15 |
| 2 | 16475 |
| 3 | 569704489 |
| 4 | 54667189410224 |
| 5 | 6242342067484101895 |
| 6 | 731267824140098782358035 |
| 7 | 85980297709044488588773397089 |
| 8 | 10114611726199237476675435354424104 |
| 9 | 1189959092808570377265545326042454670975 |
| 10 | 139997247522791157386395916200494707946968395 |
[1,15,16475,569704489,54667189410224, 6242342067484101895,731267824140098782358035, 85980297709044488588773397089, 10114611726199237476675435354424104, 1189959092808570377265545326042454670975, 139997247522791157386395916200494707946968395] |