[ Even numbers in the sequence generated by b(n)=|b(n-1)+2b(n-2)-n| ], divided by 2.

Terms

a(0) =0a(1) =0a(2) =1a(3) =0a(4) =3a(5) =0a(6) =1a(7) =4a(8) =3a(9) =4a(10) =5a(11) =5a(12) =4a(13) =7a(14) =0a(15) =0a(16) =13a(17) =2a(18) =9a(19) =4a(20) =7a(21) =9a(22) =10a(23) =10a(24) =9a(25) =14a(26) =7a(27) =6a(28) =13a(29) =22