a(n) = (11*n + 3)^3.

Terms

a(0) =27a(1) =2744a(2) =15625a(3) =46656a(4) =103823a(5) =195112a(6) =328509a(7) =512000a(8) =753571a(9) =1061208a(10) =1442897a(11) =1906624a(12) =2460375a(13) =3112136a(14) =3869893a(15) =4741632a(16) =5735339a(17) =6859000a(18) =8120601a(19) =9528128a(20) =11089567a(21) =12812904a(22) =14706125a(23) =16777216a(24) =19034163a(25) =21484952a(26) =24137569a(27) =27000000a(28) =30080231a(29) =33386248