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A213168 as a simple table

na(n)
20
30
44
533
6236
71795
815114
9141113
101451512
1116329591
12199583990
132634508789
1437362124788
15566658892787
169153720575986
17156920924159985
182845499424767984
1954420176498687983
201094805903679487982
2123112569077678079981
22510909421717094399980

[0,0,4,33,236,1795,15114,141113,1451512,16329591,
 199583990,2634508789,37362124788,566658892787,
 9153720575986,156920924159985,2845499424767984,
 54420176498687983,1094805903679487982,
 23112569077678079981,510909421717094399980]