a(n) = (5*n + 1)^3.

Terms

a(0) =1a(1) =216a(2) =1331a(3) =4096a(4) =9261a(5) =17576a(6) =29791a(7) =46656a(8) =68921a(9) =97336a(10) =132651a(11) =175616a(12) =226981a(13) =287496a(14) =357911a(15) =438976a(16) =531441a(17) =636056a(18) =753571a(19) =884736a(20) =1030301a(21) =1191016a(22) =1367631a(23) =1560896a(24) =1771561a(25) =2000376a(26) =2248091a(27) =2515456a(28) =2803221a(29) =3112136