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A230021 as a simple table

na(n)
121
2291
32991
443954
5211552
6439954
743564354
843999954
9464057476
1043999999954
11435600004354
12439560043954
13439999999954

[21,291,2991,43954,211552,439954,43564354,
 43999954,464057476,43999999954,435600004354,
 439560043954,439999999954]