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Write n in base of Catalan numbers, then interpret as if written in base 3.
1

%I #5 Mar 30 2012 17:20:36

%S 0,1,3,4,6,9,10,12,13,15,18,19,21,22,27,28,30,31,33,36,37,39,40,42,45,

%T 46,48,49,54,55,57,58,60,63,64,66,67,69,72,73,75,76,81,82,84,85,87,90,

%U 91,93,94,96,99,100,102,103,108,109,111,112,114,117,118,120

%N Write n in base of Catalan numbers, then interpret as if written in base 3.

%Y Cf. A014418.

%K nonn,easy

%O 0,3

%A _Olivier GĂ©rard_