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A188710 as a simple table

na(n)
121
2288
34084
457665
5813309
611462588
7161506225
82275402541
932056524184
10451618426905
116362474783637
1289635548416108
131262799579803897
1417790516723173509
15250635561977240232
163530992705334939489

[21,288,4084,57665,813309,11462588,161506225,
 2275402541,32056524184,451618426905,6362474783637,
 89635548416108,1262799579803897,17790516723173509,
 250635561977240232,3530992705334939489]