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A078792 as a simple table

na(n)
10
20
31
41
51
62
75
815
958
10275
111505
129003
1356931
14372973
152506312
1617165954
17119398333
18841244274
195993093551
2043109340222
21312747109787
222286190318744
2316826338257708
24124605344758149
25927910207739261
266945172081954449
2752225283886702922

[0,0,1,1,1,2,5,15,58,275,1505,9003,56931,372973,
 2506312,17165954,119398333,841244274,5993093551,
 43109340222,312747109787,2286190318744,
 16826338257708,124605344758149,927910207739261,
 6945172081954449,52225283886702922]