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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 24 |
| 4 | 137 |
| 5 | 833 |
| 6 | 5301 |
| 7 | 34946 |
| 8 | 236640 |
| 9 | 1636524 |
| 10 | 11510571 |
| 11 | 82088700 |
| 12 | 592216248 |
| 13 | 4314349823 |
| 14 | 31694295852 |
| 15 | 234526323852 |
| 16 | 1746433537565 |
| 17 | 13077886182237 |
| 18 | 98418652886229 |
| 19 | 743950197805239 |
[1,2,5,24,137,833,5301,34946,236640,1636524, 11510571,82088700,592216248,4314349823, 31694295852,234526323852,1746433537565, 13077886182237,98418652886229,743950197805239] |