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A139237 as a simple table

na(n)
15
218
31992
428704
567584
6536641536
7576460751229812736
8154742503757751030292414464
940564509722294095963578081214464
1042535214735633635831150802674328272896

[5,18,1992,28704,67584,536641536,
 576460751229812736,154742503757751030292414464,
 40564509722294095963578081214464,
 42535214735633635831150802674328272896]