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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 105 |
| 4 | 5006 |
| 5 | 360295 |
| 6 | 39069969 |
| 7 | 5967561425 |
| 8 | 1220096908540 |
| 9 | 321570878428431 |
| 10 | 106137499051583495 |
| 11 | 42873948150095461729 |
| 12 | 20803502274492921983130 |
| 13 | 11938961126118491232766895 |
| 14 | 7998487694738166709923838621 |
[0,1,105,5006,360295,39069969,5967561425, 1220096908540,321570878428431,106137499051583495, 42873948150095461729,20803502274492921983130, 11938961126118491232766895, 7998487694738166709923838621] |