a(n) = floor(Sum_{1<=i<j<=n} (sqrt(j)-sqrt(i))^2).

Terms

a(0) =0a(1) =0a(2) =2a(3) =4a(4) =8a(5) =14a(6) =22a(7) =32a(8) =45a(9) =61a(10) =80a(11) =103a(12) =130a(13) =162a(14) =198a(15) =239a(16) =286a(17) =338a(18) =397a(19) =462a(20) =533a(21) =612a(22) =698a(23) =791a(24) =893a(25) =1003a(26) =1122a(27) =1250a(28) =1387a(29) =1534