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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 36 |
| 4 | 294 |
| 5 | 2619 |
| 6 | 24707 |
| 7 | 242371 |
| 8 | 2447978 |
| 9 | 25284765 |
| 10 | 265843662 |
| 11 | 2835731692 |
| 12 | 30612741292 |
| 13 | 333824638817 |
| 14 | 3671758248394 |
| 15 | 40687442415206 |
| 16 | 453801298156927 |
| 17 | 5090406853194269 |
| 18 | 57390539385386185 |
| 19 | 649970717964393458 |
| 20 | 7391173949517432182 |
| 21 | 84358450717964077883 |
[1,1,5,36,294,2619,24707,242371,2447978,25284765, 265843662,2835731692,30612741292,333824638817, 3671758248394,40687442415206,453801298156927, 5090406853194269,57390539385386185, 649970717964393458,7391173949517432182, 84358450717964077883] |