Squares repeated; a(n) = floor(n/2)^2.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =4a(5) =4a(6) =9a(7) =9a(8) =16a(9) =16a(10) =25a(11) =25a(12) =36a(13) =36a(14) =49a(15) =49a(16) =64a(17) =64a(18) =81a(19) =81a(20) =100a(21) =100a(22) =121a(23) =121a(24) =144a(25) =144a(26) =169a(27) =169a(28) =196a(29) =196