%I #7 Mar 20 2016 12:53:12
%S 1,2,2,3,3,4,5,6,6,6,7,7,8,9,9,10,10,11,12,13,14,15,16,17,18,18,19,20,
%T 21,21,21,22,22,22,23,24,25,26,27,27,27,28,29,30,30,31,32,32,32,32,33,
%U 33,34,35,36,37,38,39,40,41,41,42,43,44,44,45,45,45,46,46,47,48,49,50,51,52,53,53,54,54,55,56,57
%N Least monotonic left inverse of A269389.
%C a(n) = number of terms of A269389 <= n.
%H Antti Karttunen, <a href="/A269362/b269362.txt">Table of n, a(n) for n = 1..10000</a>
%F a(n) = A269849(6+n) - 6.
%F Other identities. For all n >= 1:
%F a(A269389(n)) = n.
%o (Scheme, with _Antti Karttunen_'s IntSeq-library)
%o (define A269362 (LEFTINV-LEASTMONO 1 1 A269389))
%Y Cf. A269389, A269849.
%Y Cf. also A270193, A270199.
%K nonn
%O 1,2
%A _Antti Karttunen_, Mar 16 2016