a(n) = (3*n+1)^5.

Terms

a(0) =1a(1) =1024a(2) =16807a(3) =100000a(4) =371293a(5) =1048576a(6) =2476099a(7) =5153632a(8) =9765625a(9) =17210368a(10) =28629151a(11) =45435424a(12) =69343957a(13) =102400000a(14) =147008443a(15) =205962976a(16) =282475249a(17) =380204032a(18) =503284375a(19) =656356768a(20) =844596301a(21) =1073741824a(22) =1350125107a(23) =1680700000a(24) =2073071593a(25) =2535525376