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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 1 |
| 6 | 3 |
| 7 | 7 |
| 8 | 18 |
| 9 | 42 |
| 10 | 109 |
| 11 | 269 |
| 12 | 691 |
| 13 | 1759 |
| 14 | 4542 |
| 15 | 11733 |
| 16 | 30559 |
| 17 | 79743 |
| 18 | 209136 |
| 19 | 549959 |
| 20 | 1451178 |
| 21 | 3838925 |
| 22 | 10182703 |
| 23 | 27069940 |
| 24 | 72121696 |
| 25 | 192527888 |
| 26 | 514908269 |
| 27 | 1379454526 |
| 28 | 3701556642 |
| 29 | 9947456861 |
| 30 | 26770280299 |
| 31 | 72138803942 |
| 32 | 194638086892 |
| 33 | 525773470041 |
| 34 | 1421850523472 |
[1,1,3,7,18,42,109,269,691,1759,4542,11733,30559, 79743,209136,549959,1451178,3838925,10182703, 27069940,72121696,192527888,514908269,1379454526, 3701556642,9947456861,26770280299,72138803942, 194638086892,525773470041,1421850523472] |