Sum of the integer part of 7/2-th roots of integers less than n.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =7a(8) =8a(9) =9a(10) =10a(11) =11a(12) =13a(13) =15a(14) =17a(15) =19a(16) =21a(17) =23a(18) =25a(19) =27a(20) =29a(21) =31a(22) =33a(23) =35a(24) =37a(25) =39a(26) =41a(27) =43a(28) =45a(29) =47