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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 35 |
| 3 | 260 |
| 4 | 1805 |
| 5 | 12376 |
| 6 | 83175 |
| 7 | 550775 |
| 8 | 3600400 |
| 9 | 23276175 |
| 10 | 149012380 |
| 11 | 945726575 |
| 12 | 5955676150 |
| 13 | 37243117575 |
| 14 | 231412658225 |
| 15 | 1429522303905 |
| 16 | 8783382129825 |
| 17 | 53700395135475 |
| 18 | 326809026132350 |
| 19 | 1980383108328950 |
| 20 | 11952682268739660 |
| 21 | 71870696616619250 |
| 22 | 430632502970026125 |
[1,5,35,260,1805,12376,83175,550775,3600400, 23276175,149012380,945726575,5955676150, 37243117575,231412658225,1429522303905, 8783382129825,53700395135475,326809026132350, 1980383108328950,11952682268739660, 71870696616619250,430632502970026125] |