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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 50 |
| 2 | 1650 |
| 3 | 46200 |
| 4 | 1201200 |
| 5 | 30270240 |
| 6 | 756756000 |
| 7 | 19027008000 |
| 8 | 485188704000 |
| 9 | 12614906304000 |
| 10 | 335556507686400 |
| 11 | 9151541118720000 |
| 12 | 256243151324160000 |
| 13 | 7371918353479680000 |
| 14 | 217998157024327680000 |
[1,50,1650,46200,1201200,30270240,756756000, 19027008000,485188704000,12614906304000, 335556507686400,9151541118720000, 256243151324160000,7371918353479680000, 217998157024327680000] |