a(n) = (9n+1)^5.

Terms

a(0) =1a(1) =100000a(2) =2476099a(3) =17210368a(4) =69343957a(5) =205962976a(6) =503284375a(7) =1073741824a(8) =2073071593a(9) =3707398432a(10) =6240321451a(11) =10000000000a(12) =15386239549a(13) =22877577568a(14) =33038369407a(15) =46525874176a(16) =64097340625