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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 55 |
| 4 | 755 |
| 5 | 11605 |
| 6 | 191105 |
| 7 | 3296755 |
| 8 | 58810055 |
| 9 | 1075986505 |
| 10 | 20079780605 |
| 11 | 380733295855 |
| 12 | 7314056109755 |
| 13 | 142049912523805 |
| 14 | 2784519380488505 |
| 15 | 55019843803653355 |
| 16 | 1094695713838691855 |
| 17 | 21912997682690751505 |
| 18 | 440999873506064578805 |
| 19 | 8917597017732200569255 |
[1,5,55,755,11605,191105,3296755,58810055, 1075986505,20079780605,380733295855,7314056109755, 142049912523805,2784519380488505, 55019843803653355,1094695713838691855, 21912997682690751505,440999873506064578805, 8917597017732200569255] |