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A001252 as a simple table

na(n)
10
20
30
42
516
6134
71164
810982
9112354
101245676
1114909340
12191916532
132646100822
1438932850396
15609137502242
1610101955358506
17177053463254274
183270694371428814
1963524155236581118
201294248082658393546
2127604013493657933856
22615135860462018980316

[0,0,0,2,16,134,1164,10982,112354,1245676,
 14909340,191916532,2646100822,38932850396,
 609137502242,10101955358506,177053463254274,
 3270694371428814,63524155236581118,
 1294248082658393546,27604013493657933856,
 615135860462018980316]