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A049230 as a simple table

na(n)
10
20
30
40
5288
62112
711928
866192
9353544
101817208
119092592
1244547912
13214532136
141019264736
154783813296
1622238211480
17102424615968
18468396156360

[0,0,0,0,288,2112,11928,66192,353544,1817208,
 9092592,44547912,214532136,1019264736,4783813296,
 22238211480,102424615968,468396156360]