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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 39 |
| 4 | 156 |
| 5 | 651 |
| 6 | 2803 |
| 7 | 12218 |
| 8 | 54331 |
| 9 | 244094 |
| 10 | 1106978 |
| 11 | 5068058 |
| 12 | 23334902 |
| 13 | 108150502 |
| 14 | 503753548 |
| 15 | 2356387859 |
| 16 | 11069504275 |
| 17 | 52169455719 |
| 18 | 246667514552 |
| 19 | 1169587215167 |
| 20 | 5559341257547 |
| 21 | 26488381338623 |
| 22 | 126466805257309 |
| 23 | 604986670813445 |
| 24 | 2899284252998229 |
| 25 | 13916709926795557 |
| 26 | 66904010992079948 |
[1,3,10,39,156,651,2803,12218,54331,244094, 1106978,5068058,23334902,108150502,503753548, 2356387859,11069504275,52169455719,246667514552, 1169587215167,5559341257547,26488381338623, 126466805257309,604986670813445,2899284252998229, 13916709926795557,66904010992079948] |