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A250556 as a simple table

na(n)
18
260
3302
41516
57126
630780
7127586
8518052
92085808
108367220
1133513408
12134137736
13536713774
142147172564
158589316642
1634358507208
17137436497326
18549750908948
192199013454674
208796073430888
2135184332920270
22140737410034420

[8,60,302,1516,7126,30780,127586,518052,2085808,
 8367220,33513408,134137736,536713774,2147172564,
 8589316642,34358507208,137436497326,549750908948,
 2199013454674,8796073430888,35184332920270,
 140737410034420]