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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 11 |
| 4 | 35 |
| 5 | 96 |
| 6 | 310 |
| 7 | 932 |
| 8 | 3106 |
| 9 | 10719 |
| 10 | 40956 |
| 11 | 175024 |
| 12 | 856215 |
| 13 | 4745038 |
| 14 | 29240098 |
| 15 | 195682588 |
| 16 | 1397312405 |
| 17 | 10523188868 |
| 18 | 82994029902 |
| 19 | 682464226648 |
| 20 | 5833904550458 |
| 21 | 51727645023058 |
| 22 | 474880276916928 |
| 23 | 4506747119506932 |
[1,4,11,35,96,310,932,3106,10719,40956,175024, 856215,4745038,29240098,195682588,1397312405, 10523188868,82994029902,682464226648, 5833904550458,51727645023058,474880276916928, 4506747119506932] |