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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 50 |
| 2 | 2450 |
| 3 | 120050 |
| 4 | 5882450 |
| 5 | 288240050 |
| 6 | 14123762450 |
| 7 | 692064358825 |
| 8 | 33911153522400 |
| 9 | 1661646519657600 |
| 10 | 81420679319162400 |
| 11 | 3989613279580017600 |
| 12 | 195491050353532802400 |
| 13 | 9579061450374592377600 |
| 14 | 469374010237877795941800 |
[1,50,2450,120050,5882450,288240050,14123762450, 692064358825,33911153522400,1661646519657600, 81420679319162400,3989613279580017600, 195491050353532802400,9579061450374592377600, 469374010237877795941800] |