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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 50 |
| 2 | 2450 |
| 3 | 120050 |
| 4 | 5882450 |
| 5 | 288240050 |
| 6 | 14123762450 |
| 7 | 692064360050 |
| 8 | 33911153642450 |
| 9 | 1661646528480050 |
| 10 | 81420679895522450 |
| 11 | 3989613314880600050 |
| 12 | 195491052429149402450 |
| 13 | 9579061569028320720050 |
| 14 | 469374016882387715282450 |
| 15 | 22999326827236998048840050 |
[1,50,2450,120050,5882450,288240050,14123762450, 692064360050,33911153642450,1661646528480050, 81420679895522450,3989613314880600050, 195491052429149402450,9579061569028320720050, 469374016882387715282450, 22999326827236998048840050] |