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

Terms

a(0) =15a(1) =480a(2) =2145a(3) =5760a(4) =12075a(5) =21840a(6) =35805a(7) =54720a(8) =79335a(9) =110400a(10) =148665a(11) =194880a(12) =249795a(13) =314160a(14) =388725a(15) =474240a(16) =571455a(17) =681120a(18) =803985a(19) =940800a(20) =1092315a(21) =1259280a(22) =1442445a(23) =1642560a(24) =1860375a(25) =2096640a(26) =2352105a(27) =2627520a(28) =2923635a(29) =3241200