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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 2 |
| 6 | 9 |
| 7 | 13 |
| 8 | 26 |
| 9 | 74 |
| 10 | 134 |
| 11 | 325 |
| 12 | 731 |
| 13 | 1568 |
| 14 | 3625 |
| 15 | 8039 |
| 16 | 17982 |
| 17 | 40534 |
| 18 | 90659 |
| 19 | 203629 |
| 20 | 456958 |
| 21 | 1025608 |
| 22 | 2302082 |
| 23 | 5167454 |
| 24 | 11602659 |
| 25 | 26043008 |
| 26 | 58476012 |
| 27 | 131288529 |
| 28 | 294749848 |
| 29 | 661837914 |
| 30 | 1485958282 |
| 31 | 3336440686 |
| 32 | 7491565617 |
[1,1,1,2,2,9,13,26,74,134,325,731,1568,3625,8039, 17982,40534,90659,203629,456958,1025608,2302082, 5167454,11602659,26043008,58476012,131288529, 294749848,661837914,1485958282,3336440686, 7491565617] |