Sum of the first n^2 squares.

Terms

a(0) =0a(1) =14a(2) =204a(3) =1240a(4) =4900a(5) =14910a(6) =38024a(7) =85344a(8) =173880a(9) =328350a(10) =583220a(11) =984984a(12) =1594684a(13) =2490670a(14) =3771600a(15) =5559680a(16) =8004144a(17) =11284974a(18) =15616860a(19) =21253400a(20) =28491540a(21) =37676254a(22) =49205464a(23) =63535200a(24) =81185000a(25) =102743550a(26) =128874564