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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 50 |
| 2 | 2450 |
| 3 | 120050 |
| 4 | 5882450 |
| 5 | 288238825 |
| 6 | 14123642400 |
| 7 | 692055537600 |
| 8 | 33910577282400 |
| 9 | 1661611227897600 |
| 10 | 81418604280421800 |
| 11 | 3989494661371228800 |
| 12 | 195484407940615651200 |
| 13 | 9578695296400885468800 |
| 14 | 469354075590339325411200 |
[1,50,2450,120050,5882450,288238825,14123642400, 692055537600,33910577282400,1661611227897600, 81418604280421800,3989494661371228800, 195484407940615651200,9578695296400885468800, 469354075590339325411200] |