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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1539 |
| 2 | 617253 |
| 3 | 105489615 |
| 4 | 9743909175 |
| 5 | 561104814270 |
| 6 | 22155294211050 |
| 7 | 641798777779380 |
| 8 | 14341812253735200 |
| 9 | 256924158460700640 |
| 10 | 3803151504372077088 |
| 11 | 47661484991340720864 |
| 12 | 515805481647912249276 |
| 13 | 4900345026363722587050 |
| 14 | 41434653012551675362750 |
| 15 | 315469600749446851604325 |
[1,1539,617253,105489615,9743909175,561104814270, 22155294211050,641798777779380,14341812253735200, 256924158460700640,3803151504372077088, 47661484991340720864,515805481647912249276, 4900345026363722587050,41434653012551675362750, 315469600749446851604325] |