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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 7 |
| 5 | 12 |
| 6 | 30 |
| 7 | 55 |
| 8 | 141 |
| 9 | 266 |
| 10 | 688 |
| 11 | 1313 |
| 12 | 3407 |
| 13 | 6532 |
| 14 | 16970 |
| 15 | 32595 |
| 16 | 84721 |
| 17 | 162846 |
| 18 | 423348 |
| 19 | 813973 |
| 20 | 2116227 |
| 21 | 4069352 |
| 22 | 10580110 |
| 23 | 20345735 |
| 24 | 52898501 |
| 25 | 101726626 |
| 26 | 264488408 |
| 27 | 508629033 |
| 28 | 1322433847 |
| 29 | 2543136972 |
| 30 | 6612152850 |
| 31 | 12715668475 |
[1,1,2,3,7,12,30,55,141,266,688,1313,3407,6532, 16970,32595,84721,162846,423348,813973,2116227, 4069352,10580110,20345735,52898501,101726626, 264488408,508629033,1322433847,2543136972, 6612152850,12715668475] |