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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 55 |
| 3 | 785 |
| 4 | 13705 |
| 5 | 280745 |
| 6 | 6561175 |
| 7 | 171559925 |
| 8 | 4947814225 |
| 9 | 155676898925 |
| 10 | 5297647127575 |
| 11 | 193609855201625 |
| 12 | 7554669411801625 |
| 13 | 313185598385812625 |
| 14 | 13735697420477200375 |
| 15 | 634998741428031792125 |
| 16 | 30844527567399706110625 |
| 17 | 1569784302914751616023125 |
[1,5,55,785,13705,280745,6561175,171559925, 4947814225,155676898925,5297647127575, 193609855201625,7554669411801625, 313185598385812625,13735697420477200375, 634998741428031792125,30844527567399706110625, 1569784302914751616023125] |