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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 18 |
| 4 | 68 |
| 5 | 250 |
| 6 | 922 |
| 7 | 1029 |
| 8 | 580 |
| 9 | 2691 |
| 10 | 4754 |
| 11 | 2662 |
| 12 | 8474 |
| 13 | 4394 |
| 14 | 10294 |
| 15 | 2518 |
| 16 | 49732 |
| 17 | 29478 |
| 18 | 65074 |
| 19 | 123462 |
| 20 | 128818 |
| 21 | 6535 |
| 22 | 93174 |
| 23 | 36501 |
| 24 | 12058 |
| 25 | 187750 |
| 26 | 162582 |
| 27 | 297936 |
| 28 | 273782 |
| 29 | 536558 |
| 30 | 741422 |
| 31 | 59582 |
| 32 | 16964 |
| 33 | 118477 |
| 34 | 540434 |
| 35 | 132305 |
| 36 | 136130 |
| 37 | 1114366 |
| 38 | 1138598 |
| 39 | 2214594 |
| 40 | 2381618 |
| 41 | 1860867 |
| 42 | 2795686 |
| 43 | 1828661 |
| 44 | 1775622 |
| 45 | 2683618 |
| 46 | 1435710 |
| 47 | 1557345 |
| 48 | 3882778 |
[0,4,18,68,250,922,1029,580,2691,4754,2662,8474, 4394,10294,2518,49732,29478,65074,123462,128818, 6535,93174,36501,12058,187750,162582,297936, 273782,536558,741422,59582,16964,118477,540434, 132305,136130,1114366,1138598,2214594,2381618, 1860867,2795686,1828661,1775622,2683618,1435710, 1557345,3882778] |