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

Terms

a(0) =0a(1) =8a(2) =30a(3) =72a(4) =140a(5) =240a(6) =378a(7) =560a(8) =792a(9) =1080a(10) =1430a(11) =1848a(12) =2340a(13) =2912a(14) =3570a(15) =4320a(16) =5168a(17) =6120a(18) =7182a(19) =8360a(20) =9660a(21) =11088a(22) =12650a(23) =14352a(24) =16200a(25) =18200a(26) =20358a(27) =22680a(28) =25172a(29) =27840