a(n) = (10*n + 3)^3.

Terms

a(0) =27a(1) =2197a(2) =12167a(3) =35937a(4) =79507a(5) =148877a(6) =250047a(7) =389017a(8) =571787a(9) =804357a(10) =1092727a(11) =1442897a(12) =1860867a(13) =2352637a(14) =2924207a(15) =3581577a(16) =4330747a(17) =5177717a(18) =6128487a(19) =7189057a(20) =8365427a(21) =9663597a(22) =11089567a(23) =12649337a(24) =14348907a(25) =16194277a(26) =18191447a(27) =20346417a(28) =22665187a(29) =25153757