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A174565 Expansion of (1+3*x)/((1-x)*(1+3*x+4*x^2)). 1

%I

%S 1,1,-3,9,-11,1,45,-135,229,-143,-483,2025,-4139,4321,3597,-28071,

%T 69829,-97199,12285,351945,-1104971,1907137,-1301523,-3723975,

%U 16378021,-34238159,37202397,25345449,-224845931,573156001,-820084275,167628825,2777450629,-9002867183

%N Expansion of (1+3*x)/((1-x)*(1+3*x+4*x^2)).

%C Bisection of A107443.

%F a(n) = (1/2)*(1 - A087168(n+1)).

%o (MAGMA) a087168:=func< n | &+[ Binomial(n+k, 2*k)*(-2)^(n-k): k in [0..n] ] >; [ (1-a087168(n+1))/2: n in [0..35] ];

%K sign

%O 0,3

%A _Ralf Stephan_, Nov 29 2010

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Last modified October 26 11:59 EDT 2021. Contains 348267 sequences. (Running on oeis4.)