Number of cubic residues mod 5^n.

Terms

a(0) =1a(1) =5a(2) =21a(3) =101a(4) =505a(5) =2521a(6) =12601a(7) =63005a(8) =315021a(9) =1575101a(10) =7875505a(11) =39377521a(12) =196887601a(13) =984438005a(14) =4922190021a(15) =24610950101a(16) =123054750505a(17) =615273752521