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A322754 as a simple table

na(n)
10
20
30
40
50
60
71
81
91
102
115
1215
1364
14342
152344
1619137
17181098
181922215
1922472875
20284556458
213849828695
2254974808527
23819865209740
2412655913153775
25200748351368185
263253193955012557
2753619437319817482
28895778170144927928
2915129118461773051724

[0,0,0,0,0,0,1,1,1,2,5,15,64,342,2344,19137,
 181098,1922215,22472875,284556458,3849828695,
 54974808527,819865209740,12655913153775,
 200748351368185,3253193955012557,
 53619437319817482,895778170144927928,
 15129118461773051724]