a(n) = (5*n + 2)^6.

Terms

a(0) =64a(1) =117649a(2) =2985984a(3) =24137569a(4) =113379904a(5) =387420489a(6) =1073741824a(7) =2565726409a(8) =5489031744a(9) =10779215329a(10) =19770609664a(11) =34296447249a(12) =56800235584a(13) =90458382169a(14) =139314069504a(15) =208422380089a(16) =304006671424a(17) =433626201009a(18) =606355001344a(19) =832972004929