a(n) = (6*n + 1)^5.

Terms

a(0) =1a(1) =16807a(2) =371293a(3) =2476099a(4) =9765625a(5) =28629151a(6) =69343957a(7) =147008443a(8) =282475249a(9) =503284375a(10) =844596301a(11) =1350125107a(12) =2073071593a(13) =3077056399a(14) =4437053125a(15) =6240321451a(16) =8587340257a(17) =11592740743a(18) =15386239549a(19) =20113571875a(20) =25937424601a(21) =33038369407a(22) =41615795893a(23) =51888844699