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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 239 |
| 3 | 18666 |
| 4 | 947760 |
| 5 | 40792921 |
| 6 | 1642690309 |
| 7 | 64270256276 |
| 8 | 2481063626002 |
| 9 | 95151328370775 |
| 10 | 3637116511064523 |
| 11 | 138792924786810014 |
| 12 | 5291772896345008640 |
| 13 | 201669960952305135745 |
| 14 | 7683892181372221416041 |
| 15 | 292731696495415484045432 |
| 16 | 11151457805393688893262636 |
[1,239,18666,947760,40792921,1642690309, 64270256276,2481063626002,95151328370775, 3637116511064523,138792924786810014, 5291772896345008640,201669960952305135745, 7683892181372221416041,292731696495415484045432, 11151457805393688893262636] |