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A163868 as a simple table

na(n)
04
15
29
325
489
5345
61369
75465
821849
987385
10349529
111398105
125592409
1322369625
1489478489
15357913945
161431655769
175726623065
1822906492249
1991625968985
20366503875929
211466015503705
225864062014809
2323456248059225
2493824992236889
25375299968947545

[4,5,9,25,89,345,1369,5465,21849,87385,349529,
 1398105,5592409,22369625,89478489,357913945,
 1431655769,5726623065,22906492249,91625968985,
 366503875929,1466015503705,5864062014809,
 23456248059225,93824992236889,375299968947545]