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| n | a(n) |
|---|---|
| 4 | 3 |
| 5 | 6 |
| 6 | 35 |
| 7 | 71 |
| 8 | 295 |
| 9 | 751 |
| 10 | 2326 |
| 11 | 6524 |
| 12 | 22309 |
| 13 | 55992 |
| 14 | 190282 |
| 15 | 577410 |
| 16 | 1951421 |
| 17 | 5414977 |
| 18 | 19405654 |
| 19 | 64615030 |
| 20 | 238446543 |
| 21 | 726141375 |
| 22 | 2682369977 |
| 23 | 9475513873 |
| 24 | 41043824531 |
| 25 | 138540753071 |
| 26 | 524631248766 |
| 27 | 1902172512592 |
| 28 | 8404692901429 |
| 29 | 35025078519164 |
| 30 | 148160349275671 |
[3,6,35,71,295,751,2326,6524,22309,55992,190282, 577410,1951421,5414977,19405654,64615030, 238446543,726141375,2682369977,9475513873, 41043824531,138540753071,524631248766, 1902172512592,8404692901429,35025078519164, 148160349275671] |