a(n) = (3*n + 2)^5.

Terms

a(0) =32a(1) =3125a(2) =32768a(3) =161051a(4) =537824a(5) =1419857a(6) =3200000a(7) =6436343a(8) =11881376a(9) =20511149a(10) =33554432a(11) =52521875a(12) =79235168a(13) =115856201a(14) =164916224a(15) =229345007a(16) =312500000a(17) =418195493a(18) =550731776a(19) =714924299a(20) =916132832a(21) =1160290625a(22) =1453933568a(23) =1804229351a(24) =2219006624a(25) =2706784157a(26) =3276800000