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| n | a(n) |
|---|---|
| 1 | 57 |
| 2 | 124 |
| 3 | 553 |
| 4 | 1750 |
| 5 | 5325 |
| 6 | 21859 |
| 7 | 66809 |
| 8 | 222091 |
| 9 | 811643 |
| 10 | 2448916 |
| 11 | 9024626 |
| 12 | 30179690 |
| 13 | 99789149 |
| 14 | 353161702 |
| 15 | 1157895846 |
| 16 | 3982409016 |
| 17 | 13642548710 |
| 18 | 45571813573 |
| 19 | 157078910184 |
| 20 | 529972106693 |
| 21 | 1796868367572 |
| 22 | 6142685239467 |
| 23 | 20734748809544 |
[57,124,553,1750,5325,21859,66809,222091,811643, 2448916,9024626,30179690,99789149,353161702, 1157895846,3982409016,13642548710,45571813573, 157078910184,529972106693,1796868367572, 6142685239467,20734748809544] |