a(n) = dot_product(n,n-1,...2,1)*(5,6,...,n,1,2,3,4).

Terms

a(0) =45a(1) =80a(2) =126a(3) =184a(4) =255a(5) =340a(6) =440a(7) =556a(8) =689a(9) =840a(10) =1010a(11) =1200a(12) =1411a(13) =1644a(14) =1900a(15) =2180a(16) =2485a(17) =2816a(18) =3174a(19) =3560a(20) =3975a(21) =4420a(22) =4896a(23) =5404a(24) =5945a(25) =6520a(26) =7130a(27) =7776a(28) =8459a(29) =9180