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A051181 as a simple table

na(n)
00
10
20
34
4365
511770
6278455
75715094
8108498285
91963243930
1034404675635
11589459538734
129933916068505
13165358097339890
142726894329246815
1544648990949187174
16727080119853611525
1711790570902483264650
18190587735542474633995
193073193346666282232414

[0,0,0,4,365,11770,278455,5715094,108498285,
 1963243930,34404675635,589459538734,9933916068505,
 165358097339890,2726894329246815,
 44648990949187174,727080119853611525,
 11790570902483264650,190587735542474633995,
 3073193346666282232414]