a(n) = (n - 1) * (n - 2) * sigma(n).

Terms

a(0) =0a(1) =0a(2) =8a(3) =42a(4) =72a(5) =240a(6) =240a(7) =630a(8) =728a(9) =1296a(10) =1080a(11) =3080a(12) =1848a(13) =3744a(14) =4368a(15) =6510a(16) =4320a(17) =10608a(18) =6120a(19) =14364a(20) =12160a(21) =15120a(22) =11088a(23) =30360a(24) =17112a(25) =25200a(26) =26000a(27) =39312a(28) =22680a(29) =58464