a(n) = (4n+3)^5.

Terms

a(0) =243a(1) =16807a(2) =161051a(3) =759375a(4) =2476099a(5) =6436343a(6) =14348907a(7) =28629151a(8) =52521875a(9) =90224199a(10) =147008443a(11) =229345007a(12) =345025251a(13) =503284375a(14) =714924299a(15) =992436543a(16) =1350125107a(17) =1804229351a(18) =2373046875a(19) =3077056399a(20) =3939040643a(21) =4984209207a(22) =6240321451a(23) =7737809375a(24) =9509900499a(25) =11592740743