Floor of sum of the first n^2 square roots.

Terms

a(0) =0a(1) =1a(2) =6a(3) =19a(4) =44a(5) =85a(6) =146a(7) =231a(8) =345a(9) =490a(10) =671a(11) =892a(12) =1157a(13) =1470a(14) =1836a(15) =2257a(16) =2738a(17) =3283a(18) =3896a(19) =4581a(20) =5343a(21) =6184a(22) =7109a(23) =8122a(24) =9227a(25) =10428a(26) =11730a(27) =13135a(28) =14648a(29) =16273