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A178792 as a simple table

na(n)
01
15
231
3209
41471
510625
678079
7580865
84361215
932978945
10250806271
111916280833
1214698053631
13113104519169
14872801042431
156751535300609
1652337071357951
17406468580343809
183162019821780991
1924634626678980609
20192179216026959871

[1,5,31,209,1471,10625,78079,580865,4361215,
 32978945,250806271,1916280833,14698053631,
 113104519169,872801042431,6751535300609,
 52337071357951,406468580343809,3162019821780991,
 24634626678980609,192179216026959871]