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A288208 as a simple table

na(n)
10
20
30
42
52
627
7214
81695
915482
10159019
111775664
1221542628
13282722448
143989526469
1560239477384
16969280731152

[0,0,0,2,2,27,214,1695,15482,159019,1775664,
 21542628,282722448,3989526469,60239477384,
 969280731152]