a(n) = 1728000*n - 1451760.

Terms

a(0) =276240a(1) =2004240a(2) =3732240a(3) =5460240a(4) =7188240a(5) =8916240a(6) =10644240a(7) =12372240a(8) =14100240a(9) =15828240a(10) =17556240a(11) =19284240a(12) =21012240a(13) =22740240a(14) =24468240a(15) =26196240a(16) =27924240a(17) =29652240a(18) =31380240a(19) =33108240a(20) =34836240a(21) =36564240