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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 26 |
| 2 | 111096 |
| 3 | 513654400 |
| 4 | 2243178389200 |
| 5 | 9550256850912960 |
| 6 | 40141310067406592352 |
| 7 | 167483578096089845880576 |
| 8 | 695587719666862982630642400 |
| 9 | 2880023438585172541459822939200 |
[0,26,111096,513654400,2243178389200, 9550256850912960,40141310067406592352, 167483578096089845880576, 695587719666862982630642400, 2880023438585172541459822939200] |