%I #6 Jan 12 2024 10:59:50
%S 0,1,0,2,0,3,0,0,0,4,0,5,0,0,0,6,0,7,0,0,0,0,0,8,0,0,0,0,0,0,0,0,0,9,
%T 0,10,0,0,0,11,0,12,0,0,0,0,0,13,0,0,0,0,0,0,0,0,0,14,0,15,0,0,0,16,0,
%U 17,0,0,0,0,0,18,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,19,0,20,0,0,0,0,0,21,0,0,0
%N Inverse function of N -> N injection A071156.
%C a(0)=0 because A071156(0)=0, but a(n) = 0 also for those n which do not occur as values of A071156. All positive natural numbers occur here once.
%F a(n) = A057164(A085200(n)).
%Y a(A071156(n)) = n for all n.
%K nonn
%O 0,4
%A _Antti Karttunen_, Jun 14 2003
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