a(n) = floor(8^n/n).

Terms

a(0) =8a(1) =32a(2) =170a(3) =1024a(4) =6553a(5) =43690a(6) =299593a(7) =2097152a(8) =14913080a(9) =107374182a(10) =780903144a(11) =5726623061a(12) =42288908760a(13) =314146179364