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%I #18 Jul 30 2015 17:55:55
%S 3,15,18,33,51,84,135,219,354,573,927,1500,2427,3927,6354,10281,16635,
%T 26916,43551,70467,114018,184485,298503,482988,781491,1264479,2045970,
%U 3310449,5356419,8666868,14023287
%N Fibonacci sequence beginning 3, 15.
%H Harvey P. Dale, <a href="/A022381/b022381.txt">Table of n, a(n) for n = 0..1000</a>
%H Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a>
%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (1, 1).
%F G.f.: (3+12x)/(1-x-x^2). - _Philippe Deléham_, Nov 19 2008
%t a={};b=3;c=15;AppendTo[a, b];AppendTo[a, c];Do[b=b+c;AppendTo[a, b];c=b+c;AppendTo[a, c], {n, 4!}];a (* _Vladimir Joseph Stephan Orlovsky_, Sep 18 2008 *)
%t LinearRecurrence[{1,1},{3,15},40] (* _Harvey P. Dale_, May 27 2012 *)
%K nonn
%O 0,1
%A _N. J. A. Sloane_