Dot product of the squares and the quarter-squares: a(n) = sum(i=1..n, i^2 * floor(i^2/4)).

Terms

a(0) =0a(1) =4a(2) =22a(3) =86a(4) =236a(5) =560a(6) =1148a(7) =2172a(8) =3792a(9) =6292a(10) =9922a(11) =15106a(12) =22204a(13) =31808a(14) =44408a(15) =60792a(16) =81600a(17) =107844a(18) =140334a(19) =180334a(20) =228844a(21) =287408a(22) =357236a(23) =440180a(24) =537680a(25) =651924a(26) =784602a(27) =938266a(28) =1114876a(29) =1317376