a(n) = 1728000*n - 1343760.

Terms

a(0) =384240a(1) =2112240a(2) =3840240a(3) =5568240a(4) =7296240a(5) =9024240a(6) =10752240a(7) =12480240a(8) =14208240a(9) =15936240a(10) =17664240a(11) =19392240a(12) =21120240a(13) =22848240a(14) =24576240a(15) =26304240a(16) =28032240a(17) =29760240a(18) =31488240a(19) =33216240a(20) =34944240a(21) =36672240