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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 4 |
| 6 | 14 |
| 7 | 36 |
| 8 | 85 |
| 9 | 180 |
| 10 | 360 |
| 11 | 680 |
| 12 | 1234 |
| 13 | 2160 |
| 14 | 3674 |
| 15 | 6092 |
| 16 | 9882 |
| 17 | 15724 |
| 18 | 24594 |
| 19 | 37884 |
| 20 | 57553 |
| 21 | 86344 |
| 22 | 128060 |
| 23 | 187948 |
| 24 | 273178 |
| 25 | 393516 |
| 26 | 562158 |
| 27 | 796860 |
| 28 | 1121375 |
| 29 | 1567336 |
| 30 | 2176664 |
| 31 | 3004692 |
| 32 | 4124130 |
| 33 | 5630160 |
| 34 | 7646916 |
| 35 | 10335696 |
| 36 | 13905376 |
| 37 | 18625564 |
| 38 | 24843142 |
| 39 | 33003072 |
[1,4,14,36,85,180,360,680,1234,2160,3674,6092, 9882,15724,24594,37884,57553,86344,128060,187948, 273178,393516,562158,796860,1121375,1567336, 2176664,3004692,4124130,5630160,7646916,10335696, 13905376,18625564,24843142,33003072] |