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%I #14 Mar 30 2012 18:57:34
%S 0,6,15,39,84,174,342,654,1221,2241,4056,7260,12876,22662,39627,68907,
%T 119244,205482,352770,603630,1029825,1752261,2974320,5037624,8515224,
%U 14367174,24200007,40699119,68348676,114629286
%N 1-sequence of reduction of (3n) by x^2 -> x+1.
%C See A192232 for definition of "k-sequence of reduction of [sequence] by [substitution]".
%F a(n) = 3*A122491(n+1).
%F G.f.: 3*x^2*(2-x)/(1-x)/(1-x-x^2)^2. [Colin Barker, Feb 11 2012]
%t (See A192307.)
%Y Cf. A192232, A192307, A122491.
%K nonn
%O 1,2
%A _Clark Kimberling_, Jun 27 2011
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