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A188770 as a simple table

na(n)
121
2441
35357
460215
5738031
69260851
7114928827
81418719059
917534258973
10216934553467
112683742012463
1233195135531017
13410584897617051
145078597128434733
1562818418192287393
16777013463038269315

[21,441,5357,60215,738031,9260851,114928827,
 1418719059,17534258973,216934553467,2683742012463,
 33195135531017,410584897617051,5078597128434733,
 62818418192287393,777013463038269315]