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A047173 as a simple table

na(n)
10
20
30
40
53
64
712
815
940
1051
11135
12175
13455
14596
151540
162037
175250
187000
1918000
2024156
2162007
2283667
23214467
24290719
25744315
261012935
272590679
283537703
299039823
3012381252
3131612324
3243411489
33110761494
34152459010

[0,0,0,0,3,4,12,15,40,51,135,175,455,596,1540,
 2037,5250,7000,18000,24156,62007,83667,214467,
 290719,744315,1012935,2590679,3537703,9039823,
 12381252,31612324,43411489,110761494,152459010]