| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 50 |
| 2 | 2450 |
| 3 | 120050 |
| 4 | 5882450 |
| 5 | 288240050 |
| 6 | 14123762450 |
| 7 | 692064360050 |
| 8 | 33911153641225 |
| 9 | 1661646528360000 |
| 10 | 81420679886700000 |
| 11 | 3989613314304240000 |
| 12 | 195491052393848820000 |
| 13 | 9579061566952704120000 |
| 14 | 469374016763733986940000 |
[1,50,2450,120050,5882450,288240050,14123762450, 692064360050,33911153641225,1661646528360000, 81420679886700000,3989613314304240000, 195491052393848820000,9579061566952704120000, 469374016763733986940000] |