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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 23 |
| 3 | 68 |
| 4 | 295 |
| 5 | 1029 |
| 6 | 3932 |
| 7 | 15029 |
| 8 | 56415 |
| 9 | 213788 |
| 10 | 807845 |
| 11 | 3054887 |
| 12 | 11551608 |
| 13 | 43672327 |
| 14 | 165135129 |
| 15 | 624374584 |
| 16 | 2360781157 |
| 17 | 8926215203 |
| 18 | 33750290592 |
| 19 | 127611145241 |
| 20 | 482502180893 |
| 21 | 1824357955536 |
| 22 | 6897962766699 |
| 23 | 26081442528097 |
[3,23,68,295,1029,3932,15029,56415,213788,807845, 3054887,11551608,43672327,165135129,624374584, 2360781157,8926215203,33750290592,127611145241, 482502180893,1824357955536,6897962766699, 26081442528097] |