a(n) = (7*n + 2)^5.

Terms

a(0) =32a(1) =59049a(2) =1048576a(3) =6436343a(4) =24300000a(5) =69343957a(6) =164916224a(7) =345025251a(8) =656356768a(9) =1160290625a(10) =1934917632a(11) =3077056399a(12) =4704270176a(13) =6956883693a(14) =10000000000a(15) =14025517307a(16) =19254145824a(17) =25937424601