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A005199 as a simple table

na(n)
10
21
31
44
56
618
735
893
9214
10549
111362
123534
139102
1423951
1563192
16168561
17451764
181219290
193305783
209008027
2124643538
2267681372
23186504925
24515566016
251429246490
263972598378
2711068477743
2830908170493
2986488245455
30242481159915
31681048784377
321916051725977
335399062619966

[0,1,1,4,6,18,35,93,214,549,1362,3534,9102,23951,
 63192,168561,451764,1219290,3305783,9008027,
 24643538,67681372,186504925,515566016,1429246490,
 3972598378,11068477743,30908170493,86488245455,
 242481159915,681048784377,1916051725977,
 5399062619966]