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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 15 |
| 2 | 877 |
| 3 | 115975 |
| 4 | 27644437 |
| 5 | 10480142147 |
| 6 | 5832742205057 |
| 7 | 4506715738447323 |
| 8 | 4638590332229999353 |
| 9 | 6160539404599934652455 |
| 10 | 10293358946226376485095653 |
| 11 | 21195039388640360462388656799 |
| 12 | 52868366208550447901945575624941 |
| 13 | 157450588391204931289324344702531067 |
[1,15,877,115975,27644437,10480142147, 5832742205057,4506715738447323, 4638590332229999353,6160539404599934652455, 10293358946226376485095653, 21195039388640360462388656799, 52868366208550447901945575624941, 157450588391204931289324344702531067] |