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A093742 as a simple table

na(n)
10
20
37
454
5484
64233
735394
8293201
92464565
1020943953
11179718000
121556469349
1313597962107
14119731244640
151061769557793
169476573902533
1785076550195696
18767846949916102

[0,0,7,54,484,4233,35394,293201,2464565,20943953,
 179718000,1556469349,13597962107,119731244640,
 1061769557793,9476573902533,85076550195696,
 767846949916102]