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A054141 as a simple table

na(n)
12
26
331
4180
51101
66901
743828
8280664
91807909
1011698479
1175973701
12494890116
133231949644
1421153128028
15138712184488

[2,6,31,180,1101,6901,43828,280664,1807909,
 11698479,75973701,494890116,3231949644,
 21153128028,138712184488]