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

Terms

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