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A113617 as a simple table

na(n)
12
25
317
48893
5868151
63875933
7219554912086470964379
863036368490471985096643
926151660747268050131008657684404431

[2,5,17,8893,868151,3875933,219554912086470964379,
 63036368490471985096643,
 26151660747268050131008657684404431]