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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 50 |
| 2 | 8910 |
| 3 | 2011100 |
| 4 | 503909070 |
| 5 | 133954543800 |
| 6 | 36992598142500 |
| 7 | 10491379251679040 |
| 8 | 3034472729231379150 |
| 9 | 891028813210575018980 |
| 10 | 264787855164104281785160 |
| 11 | 79455812929030151249454000 |
| 12 | 24035311050907120054564683300 |
| 13 | 7320107028326385998504601648000 |
[1,50,8910,2011100,503909070,133954543800, 36992598142500,10491379251679040, 3034472729231379150,891028813210575018980, 264787855164104281785160, 79455812929030151249454000, 24035311050907120054564683300, 7320107028326385998504601648000] |