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A259087 as a simple table

na(n)
10
21
31
44
56
628
783
8289
91030
103860
1114154
1253222
13202001
14771255
152945803
1611304541
1743564276
18168413249
19652292925
202531493604
219845752518
2238372748112

[0,1,1,4,6,28,83,289,1030,3860,14154,53222,202001,
 771255,2945803,11304541,43564276,168413249,
 652292925,2531493604,9845752518,38372748112]