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A020090 as a simple table

na(n)
01
10
20
31
46
529
6162
71055
87918
967303
10639383
116713530
1277205601
13965070017
1413028445231
15188912455860
162928143065834
1748314360586264
18845501310259627
1915641774239803107
20305014597676160593
216252799252361292173

[1,0,0,1,6,29,162,1055,7918,67303,639383,6713530,
 77205601,965070017,13028445231,188912455860,
 2928143065834,48314360586264,845501310259627,
 15641774239803107,305014597676160593,
 6252799252361292173]