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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 11 |
| 4 | 33 |
| 5 | 87 |
| 6 | 241 |
| 7 | 655 |
| 8 | 1793 |
| 9 | 4895 |
| 10 | 13377 |
| 11 | 36543 |
| 12 | 99841 |
| 13 | 272767 |
| 14 | 745217 |
| 15 | 2035967 |
| 16 | 5562369 |
| 17 | 15196671 |
| 18 | 41518081 |
| 19 | 113429503 |
| 20 | 309895169 |
| 21 | 846649343 |
| 22 | 2313089025 |
| 23 | 6319476735 |
| 24 | 17265131521 |
| 25 | 47169216511 |
| 26 | 128868696065 |
| 27 | 352075825151 |
| 28 | 961889042433 |
| 29 | 2627929735167 |
[1,1,5,11,33,87,241,655,1793,4895,13377,36543, 99841,272767,745217,2035967,5562369,15196671, 41518081,113429503,309895169,846649343,2313089025, 6319476735,17265131521,47169216511,128868696065, 352075825151,961889042433,2627929735167] |