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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 50 |
| 2 | 1250 |
| 3 | 20850 |
| 4 | 261250 |
| 5 | 2625010 |
| 6 | 22049250 |
| 7 | 159369650 |
| 8 | 1012597250 |
| 9 | 5749494450 |
| 10 | 29557550050 |
| 11 | 139056632050 |
| 12 | 604033925250 |
| 13 | 2440870708850 |
| 14 | 9235138753250 |
| 15 | 32899217125170 |
| 16 | 110890799925250 |
| 17 | 355178132537650 |
[1,50,1250,20850,261250,2625010,22049250, 159369650,1012597250,5749494450,29557550050, 139056632050,604033925250,2440870708850, 9235138753250,32899217125170,110890799925250, 355178132537650] |