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A189156 as a simple table

na(n)
115
2225
33375
437976
5424401
64597967
748460966
8507947896
95289780940
1054890361712
11568739622865
125886254888757
1360885233141712
14629580674428109
156508873299252199
1667284551942503294
17695503798053171610

[15,225,3375,37976,424401,4597967,48460966,
 507947896,5289780940,54890361712,568739622865,
 5886254888757,60885233141712,629580674428109,
 6508873299252199,67284551942503294,
 695503798053171610]