a(n) = (8*n + 2)^5.

Terms

a(0) =32a(1) =100000a(2) =1889568a(3) =11881376a(4) =45435424a(5) =130691232a(6) =312500000a(7) =656356768a(8) =1252332576a(9) =2219006624a(10) =3707398432a(11) =5904900000a(12) =9039207968a(13) =13382255776a(14) =19254145824a(15) =27027081632a(16) =37129300000a(17) =50049003168a(18) =66338290976a(19) =86617093024a(20) =111577100832a(21) =141985700000a(22) =178689902368