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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 2 |
| 6 | 6 |
| 7 | 16 |
| 8 | 43 |
| 9 | 113 |
| 10 | 300 |
| 11 | 787 |
| 12 | 2074 |
| 13 | 5460 |
| 14 | 14391 |
| 15 | 37960 |
| 16 | 100275 |
| 17 | 265187 |
| 18 | 702307 |
| 19 | 1862463 |
| 20 | 4945952 |
| 21 | 13152441 |
| 22 | 35023003 |
| 23 | 93385548 |
| 24 | 249330208 |
| 25 | 666539949 |
| 26 | 1784102735 |
| 27 | 4781254117 |
| 28 | 12828545419 |
| 29 | 34459732110 |
| 30 | 92668129050 |
| 31 | 249469906115 |
| 32 | 672296028786 |
| 33 | 1813606782459 |
[1,2,6,16,43,113,300,787,2074,5460,14391,37960, 100275,265187,702307,1862463,4945952,13152441, 35023003,93385548,249330208,666539949,1784102735, 4781254117,12828545419,34459732110,92668129050, 249469906115,672296028786,1813606782459] |