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%I #7 Jun 15 2014 14:46:41
%S 1,2,1,0,4,4,4,4,5,5,5,5,6,6,6,6,7,7,7,7,8,8,8,8,8,9,9,9,9,9,10,10,10,
%T 10,10,11,11,11,11,11,12,12,12,12,12,12,13,13,13,13,13,13,14,14,14,14,
%U 14,14,15,15,15,15,15,15,16,16,16,16,16,16,16,17,17,17,17,17,17,17,18
%N a(n) = least nonnegative integer such that n appears a(n) times.
%C The concatenation of the first four terms' (decimal) digits gives 1210 = A046043(1).
%e Note that we do not need to specify a(0) explicitly. Indeed, a(0) = 1 as it cannot be 0. a(1) = 2 as it cannot be 0 or 1.
%Y Cf. A046043 (Autobiographical numbers), A001462 (Golomb's sequence).
%K nonn
%O 0,2
%A _Rick L. Shepherd_, Jun 20 2005
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