%I #4 Mar 30 2012 18:56:20
%S 4,18,36,54,63,65,67,69,71,72,73,75,77,79,90,108,126,144,167,194,221,
%T 248,262,265,268,271,274,275,277,280,283,286,302,329,356,383,410,437,
%U 464,491,505,508,511,514,517,518,520,523,526
%N Position of n-th 4 in A031076.
%K nonn
%O 1,1
%A _Clark Kimberling_