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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 15 |
| 4 | 145 |
| 5 | 2489 |
| 6 | 83021 |
| 7 | 5402565 |
| 8 | 697174827 |
| 9 | 179186086779 |
| 10 | 91923934089991 |
| 11 | 94222398574777359 |
| 12 | 193061880430280639843 |
| 13 | 790974713509247761511635 |
| 14 | 6480456214858268755580705051 |
| 15 | 106182276664343738404944887223883 |
[1,1,3,15,145,2489,83021,5402565,697174827, 179186086779,91923934089991,94222398574777359, 193061880430280639843,790974713509247761511635, 6480456214858268755580705051, 106182276664343738404944887223883] |