a(n) = (4n+2)^5.

Terms

a(0) =32a(1) =7776a(2) =100000a(3) =537824a(4) =1889568a(5) =5153632a(6) =11881376a(7) =24300000a(8) =45435424a(9) =79235168a(10) =130691232a(11) =205962976a(12) =312500000a(13) =459165024a(14) =656356768a(15) =916132832a(16) =1252332576a(17) =1680700000a(18) =2219006624a(19) =2887174368a(20) =3707398432a(21) =4704270176a(22) =5904900000a(23) =7339040224a(24) =9039207968a(25) =11040808032