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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 11 |
| 5 | 35 |
| 6 | 112 |
| 7 | 350 |
| 8 | 1087 |
| 9 | 3351 |
| 10 | 10286 |
| 11 | 31460 |
| 12 | 95966 |
| 13 | 292110 |
| 14 | 887629 |
| 15 | 2693423 |
| 16 | 8163367 |
| 17 | 24717575 |
| 18 | 74778718 |
| 19 | 226066940 |
| 20 | 683006416 |
| 21 | 2062412936 |
| 22 | 6224697139 |
| 23 | 18779180645 |
| 24 | 56633215930 |
| 25 | 170733734210 |
| 26 | 514559844007 |
| 27 | 1550364293145 |
[1,3,11,35,112,350,1087,3351,10286,31460,95966, 292110,887629,2693423,8163367,24717575,74778718, 226066940,683006416,2062412936,6224697139, 18779180645,56633215930,170733734210,514559844007, 1550364293145] |