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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 4 |
| 5 | 17 |
| 6 | 82 |
| 7 | 422 |
| 8 | 2274 |
| 9 | 12665 |
| 10 | 72326 |
| 11 | 421214 |
| 12 | 2492112 |
| 13 | 14937210 |
| 14 | 90508256 |
| 15 | 553492552 |
| 16 | 3411758334 |
| 17 | 21175624713 |
| 18 | 132226234854 |
| 19 | 830077057878 |
| 20 | 5235817447752 |
| 21 | 33166634502334 |
| 22 | 210904780742860 |
| 23 | 1345806528336772 |
| 24 | 8614979593487972 |
| 25 | 55307373497626442 |
| 26 | 356012579697723084 |
[1,4,17,82,422,2274,12665,72326,421214,2492112, 14937210,90508256,553492552,3411758334, 21175624713,132226234854,830077057878, 5235817447752,33166634502334,210904780742860, 1345806528336772,8614979593487972, 55307373497626442,356012579697723084] |