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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 9 |
| 8 | 42 |
| 9 | 132 |
| 10 | 334 |
| 11 | 728 |
| 12 | 1428 |
| 13 | 2584 |
| 14 | 4389 |
| 15 | 7084 |
| 16 | 10963 |
| 17 | 16380 |
| 18 | 23751 |
| 19 | 33563 |
| 20 | 46376 |
| 21 | 62832 |
| 22 | 83657 |
| 23 | 109668 |
| 24 | 141778 |
| 25 | 181001 |
| 26 | 228459 |
| 27 | 285384 |
| 28 | 353127 |
| 29 | 433160 |
| 30 | 527085 |
| 31 | 636636 |
| 32 | 763686 |
| 33 | 910252 |
| 34 | 1078500 |
| 35 | 1270752 |
| 36 | 1489488 |
| 37 | 1737355 |
| 38 | 2017169 |
| 39 | 2331924 |
[1,9,42,132,334,728,1428,2584,4389,7084,10963, 16380,23751,33563,46376,62832,83657,109668,141778, 181001,228459,285384,353127,433160,527085,636636, 763686,910252,1078500,1270752,1489488,1737355, 2017169,2331924] |