Number of n-digit perfect cubes.

Terms

a(0) =2a(1) =2a(2) =5a(3) =12a(4) =25a(5) =53a(6) =116a(7) =249a(8) =535a(9) =1155a(10) =2487a(11) =5358a(12) =11545a(13) =24871a(14) =53584a(15) =115444a(16) =248715a(17) =535841a(18) =1154435a(19) =2487154a(20) =5358411a(21) =11544347a(22) =24871542a(23) =53584111a(24) =115443470a(25) =248715414a(26) =535841116a(27) =1154434691a(28) =2487154143a(29) =5358411166