a(n) = (12*n + 9)^5.

Terms

a(0) =59049a(1) =4084101a(2) =39135393a(3) =184528125a(4) =601692057a(5) =1564031349a(6) =3486784401a(7) =6956883693a(8) =12762815625a(9) =21924480357a(10) =35723051649a(11) =55730836701a(12) =83841135993a(13) =122298103125a(14) =173726604657a(15) =241162079949a(16) =328080401001a(17) =438427732293a(18) =576650390625a(19) =747724704957a(20) =957186876249