a(n) = (10*n + 6)^5.

Terms

a(0) =7776a(1) =1048576a(2) =11881376a(3) =60466176a(4) =205962976a(5) =550731776a(6) =1252332576a(7) =2535525376a(8) =4704270176a(9) =8153726976a(10) =13382255776a(11) =21003416576a(12) =31757969376a(13) =46525874176a(14) =66338290976a(15) =92389579776a(16) =126049300576