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A348102 as a simple table

na(n)
01
12
25
312
434
5102
6374
71680
810271
991878
101308856
1131048616
121243411976
1383446254312
149312844044030
151715236203607456

[1,2,5,12,34,102,374,1680,10271,91878,1308856,
 31048616,1243411976,83446254312,9312844044030,
 1715236203607456]