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a(n) = position of n in A050020.
1

%I #8 Sep 06 2015 18:56:12

%S 1,4,12,20,3,11,15,19,36,2,40,10,44,87,14,48,18,78,35,5,95,39,138,69,

%T 9,99,43,86,211,13,30,47,241,159,17,215,77,34,64,21,245,163,94,150,38,

%U 288,137,68,124,8,249,98,318,236,42,85,141,495,210

%N a(n) = position of n in A050020.

%H Ivan Neretin, <a href="/A050021/b050021.txt">Table of n, a(n) for n = 1..1000</a>

%K nonn,easy

%O 1,2

%A _Clark Kimberling_

%E Three terms corrected by _Ivan Neretin_, Sep 06 2015