%I

%S 1,5,1,5,17,21,17,21,1,5,1,5,17,21,17,21,65,69,65,69,81,85,81,85,65,

%T 69,65,69

%N a(n) is in A145818 such that (4n-1-a(n))/2 is in A145818 as well

%C Note that a(4n)=a(4n-2), a(4n-1)=a(4n-3).

%Y A145818 A145812 A145819 A145822

%K nonn

%O 1,2

%A _Vladimir Shevelev_, Oct 20 2008