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A088028 as a simple table

na(n)
12
24
314
434
5254
6664
75116
818446
9121694
10887314
117496644
1263124214
13684394346
143086525014
1525689944554
16453164666954

[2,4,14,34,254,664,5116,18446,121694,887314,
 7496644,63124214,684394346,3086525014,25689944554,
 453164666954]