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%I #6 Nov 27 2015 00:17:33
%S 0,1,1,2,2,3,3,4,4,4,4,4,4,5,5,5,5,6,6,7,7,7,7,8,8,8,8,9,9,10,10,11,
%T 11,11,11,12,12,13,13,13,13,14,14,15,15,15,15,15,15,15,15,16,16,17,17,
%U 17,17,18,18,19,19,20,20,20,20,21,21,22,22,22,22,23,23,24,24,24,24,25,25,26
%N Least monotonic left inverse for A261089; a(n) = largest k for which A261089(k) <= n.
%H Antti Karttunen, <a href="/A263089/b263089.txt">Table of n, a(n) for n = 0..12332</a>
%o (Scheme, with _Antti Karttunen_'s IntSeq-library)
%o (define A263089 (LEFTINV-LEASTMONO 0 0 A261089))
%Y Cf. A155043, A261089, A263259.
%K nonn
%O 0,4
%A _Antti Karttunen_, Nov 24 2015