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A143868 as a simple table

na(n)
18
284
3815
47922
577250
6759077
77492588
874198995
9736401956
107319543972
1172834161468
12725344237597

[8,84,815,7922,77250,759077,7492588,74198995,
 736401956,7319543972,72834161468,725344237597]