a(n) = sum of remainders of n mod 1,3,5,...,2k-1, where k = [ (n+1)/2 ].

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =1a(6) =3a(7) =6a(8) =6a(9) =5a(10) =9a(11) =11a(12) =16a(13) =15a(14) =13a(15) =20a(16) =27a(17) =23a(18) =31a(19) =35a(20) =34a(21) =33a(22) =43a(23) =51a(24) =57a(25) =56a(26) =56a(27) =62a(28) =75a(29) =66