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A156605 as a simple table

na(n)
07
18
212
328
492
5348
61372
75468
821852
987388
10349532
111398108
125592412
1322369628
1489478492
15357913948
161431655772
175726623068
1822906492252
1991625968988
20366503875932
211466015503708
225864062014812
2323456248059228
2493824992236892
25375299968947548

[7,8,12,28,92,348,1372,5468,21852,87388,349532,
 1398108,5592412,22369628,89478492,357913948,
 1431655772,5726623068,22906492252,91625968988,
 366503875932,1466015503708,5864062014812,
 23456248059228,93824992236892,375299968947548]