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A253217 as a simple table

na(n)
10
20
31
419
5268
63568
747698
8649712
99023385
10127419681
111823918697
1226398702645
13385582981615
145674890516295
1584060883775765
161252066289632643
1718738613233957420
18281620474177057788
194248088188086420832

[0,0,1,19,268,3568,47698,649712,9023385,127419681,
 1823918697,26398702645,385582981615,5674890516295,
 84060883775765,1252066289632643,18738613233957420,
 281620474177057788,4248088188086420832]