a(n) = (9*n + 3)^5.

Terms

a(0) =243a(1) =248832a(2) =4084101a(3) =24300000a(4) =90224199a(5) =254803968a(6) =601692057a(7) =1252332576a(8) =2373046875a(9) =4182119424a(10) =6956883693a(11) =11040808032a(12) =16850581551a(13) =24883200000a(14) =35723051649a(15) =50049003168a(16) =68641485507a(17) =92389579776a(18) =122298103125a(19) =159494694624a(20) =205236901143a(21) =260919263232