%I A009993
%S A009993 0,1,2,3,4,5,6,7,8,9,12,13,14,15,16,17,18,19,23,24,25,26,27,28,29,34,35,
%T A009993 36,37,38,39,45,46,47,48,49,56,57,58,59,67,68,69,78,79,89,123,124,125,
%U A009993 126,127,128,129,134,135,136,137,138,139,145,146,147,148,149,156,157
%N A009993 List of numbers whose decimal digits are in strictly increasing order.
%C A009993 Sequence has 512 terms, since every term except 0 corresponds to a nonempty 
               subset of {1,2,3,4,5,6,7,8,9}.
%H A009993 Zak Seidov, <a href="b009993.txt">Table of n, a(n) for n = 1..512</a>
%H A009993 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               Digit.html">Link to a section of The World of Mathematics.</a>
%t A009993 Flatten@Table[FromDigits/@Subsets[Range[1,9],{n}],{n,0,9}] (Zak Seidov)
%Y A009993 Cf. A009995.
%Y A009993 Sequence in context: A082757 A032881 A032848 this_sequence A055569 A072618 
               A069784
%Y A009993 Adjacent sequences: A009990 A009991 A009992 this_sequence A009994 A009995 
               A009996
%K A009993 nonn,fini,base
%O A009993 1,3
%A A009993 N. J. A. Sloane (njas(AT)research.att.com).