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A278913 as a simple table

na(n)
12
24
316
464
59765625
64096
765536
8262144
91471383076677527699142172838322885948765175969
1010264895304762966931257013446474591264089923314972889033759201
111073741824
1218701397461209715023927088008788055619800417991632621566284510161

[2,4,16,64,9765625,4096,65536,262144,
 1471383076677527699142172838322885948765175969,
 10264895304762966931257013446474591264089923314972\
 889033759201,1073741824,
 18701397461209715023927088008788055619800417991632\
 621566284510161]