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A005978 as a simple table

na(n)
10
20
30
40
51
64
719
893
9539
103474
1124856
12192972
131613219
1414410374
15136920388
161378542639
1714663082556
18164340455701
191936286904952
2023932267735948
21309701296575063

[0,0,0,0,1,4,19,93,539,3474,24856,192972,1613219,
 14410374,136920388,1378542639,14663082556,
 164340455701,1936286904952,23932267735948,
 309701296575063]