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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 45 |
| 4 | 575 |
| 5 | 8005 |
| 6 | 118925 |
| 7 | 1848175 |
| 8 | 29683375 |
| 9 | 488787945 |
| 10 | 8207945825 |
| 11 | 140023324375 |
| 12 | 2419926703375 |
| 13 | 42278635863875 |
| 14 | 745496061139125 |
| 15 | 13249931378913125 |
| 16 | 237123418577294375 |
| 17 | 4269329970987934055 |
| 18 | 77279684433882711925 |
| 19 | 1405520392608578792025 |
| 20 | 25672052588664668494375 |
| 21 | 470709407862301830257925 |
[1,5,45,575,8005,118925,1848175,29683375, 488787945,8207945825,140023324375,2419926703375, 42278635863875,745496061139125,13249931378913125, 237123418577294375,4269329970987934055, 77279684433882711925,1405520392608578792025, 25672052588664668494375,470709407862301830257925] |