Sum of the integer part of 4th roots of integers <= 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) =12a(13) =13a(14) =14a(15) =15a(16) =17a(17) =19a(18) =21a(19) =23a(20) =25a(21) =27a(22) =29a(23) =31a(24) =33a(25) =35a(26) =37a(27) =39a(28) =41a(29) =43