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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 5 |
| 2 | 50 |
| 3 | 455 |
| 4 | 4100 |
| 5 | 36905 |
| 6 | 332150 |
| 7 | 2989355 |
| 8 | 26904200 |
| 9 | 242137805 |
| 10 | 2179240250 |
| 11 | 19613162255 |
| 12 | 176518460300 |
| 13 | 1588666142705 |
| 14 | 14297995284350 |
| 15 | 128681957559155 |
| 16 | 1158137618032400 |
| 17 | 10423238562291605 |
| 18 | 93809147060624450 |
| 19 | 844282323545620055 |
| 20 | 7598540911910580500 |
[0,5,50,455,4100,36905,332150,2989355,26904200, 242137805,2179240250,19613162255,176518460300, 1588666142705,14297995284350,128681957559155, 1158137618032400,10423238562291605, 93809147060624450,844282323545620055, 7598540911910580500] |