Partial sums of floor(n^2/5) (A118015).

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =4a(5) =9a(6) =16a(7) =25a(8) =37a(9) =53a(10) =73a(11) =97a(12) =125a(13) =158a(14) =197a(15) =242a(16) =293a(17) =350a(18) =414a(19) =486a(20) =566a(21) =654a(22) =750a(23) =855a(24) =970a(25) =1095a(26) =1230a(27) =1375a(28) =1531a(29) =1699