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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 15 |
| 3 | 1135 |
| 4 | 270505 |
| 5 | 156871831 |
| 6 | 188025705967 |
| 7 | 416173882222435 |
| 8 | 1566458213011786353 |
| 9 | 9414868642191013899763 |
| 10 | 85981737271975254601910791 |
| 11 | 1146206793004124302295533827799 |
| 12 | 21577353890734087115034666517219417 |
| 13 | 557877603681751612952474803153076092591 |
[1,15,1135,270505,156871831,188025705967, 416173882222435,1566458213011786353, 9414868642191013899763,85981737271975254601910791, 1146206793004124302295533827799, 21577353890734087115034666517219417, 557877603681751612952474803153076092591] |