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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 20 |
| 4 | 99 |
| 5 | 483 |
| 6 | 2855 |
| 7 | 16759 |
| 8 | 112794 |
| 9 | 777862 |
| 10 | 5864191 |
| 11 | 45388575 |
| 12 | 381557427 |
| 13 | 3265488790 |
| 14 | 29815712658 |
| 15 | 279926300139 |
| 16 | 2762328453142 |
| 17 | 27952237049003 |
| 18 | 296275051753578 |
| 19 | 3212312177119572 |
| 20 | 36258222471852860 |
| 21 | 419025393587012853 |
| 22 | 5010022284030897550 |
[1,1,5,20,99,483,2855,16759,112794,777862,5864191, 45388575,381557427,3265488790,29815712658, 279926300139,2762328453142,27952237049003, 296275051753578,3212312177119572, 36258222471852860,419025393587012853, 5010022284030897550] |