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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 19 |
| 3 | 1005 |
| 4 | 62601 |
| 5 | 6061545 |
| 6 | 868380535 |
| 7 | 142349568361 |
| 8 | 27564092244689 |
| 9 | 6325532235438273 |
| 10 | 1673378033771898675 |
| 11 | 505141951803309946125 |
| 12 | 170002056228253072537065 |
| 13 | 63255335047795174479833625 |
| 14 | 25805276337820748477042392695 |
| 15 | 11427131417576257617280878155625 |
[1,1,19,1005,62601,6061545,868380535,142349568361, 27564092244689,6325532235438273, 1673378033771898675,505141951803309946125, 170002056228253072537065, 63255335047795174479833625, 25805276337820748477042392695, 11427131417576257617280878155625] |