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a(n)=(s(n)+2)/4, where s(n)=n-th base 4 palindrome that starts with 2.
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%I #5 Jul 12 2012 00:39:46

%S 1,3,9,10,11,12,33,38,43,48,129,133,137,141,146,150,154,158,163,167,

%T 171,175,180,184,188,192,513,533,553,573,578,598,618,638,643,663,683,

%U 703,708,728,748,768,2049,2065,2081,2097,2117,2133

%N a(n)=(s(n)+2)/4, where s(n)=n-th base 4 palindrome that starts with 2.

%K nonn,base

%O 1,2

%A _Clark Kimberling_