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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 25 |
| 6 | 85 |
| 7 | 215 |
| 8 | 477 |
| 9 | 985 |
| 10 | 1949 |
| 11 | 3755 |
| 12 | 7113 |
| 13 | 13329 |
| 14 | 24805 |
| 15 | 45959 |
| 16 | 84917 |
| 17 | 156625 |
| 18 | 288573 |
| 19 | 531323 |
| 20 | 977873 |
| 21 | 1799273 |
| 22 | 3310133 |
| 23 | 6089111 |
| 24 | 11200525 |
| 25 | 20601961 |
| 26 | 37893981 |
| 27 | 69699051 |
| 28 | 128197785 |
| 29 | 235793825 |
| 30 | 433693893 |
| 31 | 797688967 |
| 32 | 1467180389 |
[1,25,85,215,477,985,1949,3755,7113,13329,24805, 45959,84917,156625,288573,531323,977873,1799273, 3310133,6089111,11200525,20601961,37893981, 69699051,128197785,235793825,433693893,797688967, 1467180389] |