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A018157 as a simple table

na(n)
01
12
23
35
49
515
626
744
876
9131
10225
11387
12665
131142
141964
153375
165801
179970
1817137
1929454
2050625
2187013
22149555
23257051
24441813
25759375
261305192
272243328
283855769
296627188
3011390625
3119577886
3233649922

[1,2,3,5,9,15,26,44,76,131,225,387,665,1142,1964,
 3375,5801,9970,17137,29454,50625,87013,149555,
 257051,441813,759375,1305192,2243328,3855769,
 6627188,11390625,19577886,33649922]