a(n) = n^2 * floor(n/2).

Terms

a(0) =0a(1) =0a(2) =4a(3) =9a(4) =32a(5) =50a(6) =108a(7) =147a(8) =256a(9) =324a(10) =500a(11) =605a(12) =864a(13) =1014a(14) =1372a(15) =1575a(16) =2048a(17) =2312a(18) =2916a(19) =3249a(20) =4000a(21) =4410a(22) =5324a(23) =5819a(24) =6912a(25) =7500a(26) =8788a(27) =9477a(28) =10976a(29) =11774