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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 17 |
| 3 | 45 |
| 4 | 229 |
| 5 | 1081 |
| 6 | 4449 |
| 7 | 16249 |
| 8 | 57917 |
| 9 | 216665 |
| 10 | 850453 |
| 11 | 3388125 |
| 12 | 13562845 |
| 13 | 54314069 |
| 14 | 217491413 |
| 15 | 870211181 |
[1,5,17,45,229,1081,4449,16249,57917,216665, 850453,3388125,13562845,54314069,217491413, 870211181] |