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A093981 as a simple table

na(n)
10
20
30
40
54
6140
72403
833593
9410754
104627165
1149484726
12511589763
135167085638
1451359117940
15504751212449
164920758221226
1747694473239363
18460356869024451

[0,0,0,0,4,140,2403,33593,410754,4627165,49484726,
 511589763,5167085638,51359117940,504751212449,
 4920758221226,47694473239363,460356869024451]