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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 33 |
| 4 | 331 |
| 5 | 1255 |
| 6 | 7331 |
| 7 | 23137 |
| 8 | 528627 |
| 9 | 1678091 |
| 10 | 9634009 |
| 11 | 28382599 |
| 12 | 330241631 |
| 13 | 950294211 |
| 14 | 5450472475 |
| 15 | 15571967713 |
| 16 | 701569265347 |
| 17 | 1972778241139 |
| 18 | 11081264027421 |
| 19 | 30752846697963 |
| 20 | 341394914833541 |
| 21 | 942115702568569 |
| 22 | 5177065777113957 |
| 23 | 14160495993439431 |
| 24 | 309192824835902071 |
[1,1,7,33,331,1255,7331,23137,528627,1678091, 9634009,28382599,330241631,950294211,5450472475, 15571967713,701569265347,1972778241139, 11081264027421,30752846697963,341394914833541, 942115702568569,5177065777113957, 14160495993439431,309192824835902071] |