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A184884 Diagonal sums of number triangle A184883. 2

%I

%S 1,1,2,6,11,27,60,132,301,669,1502,3370,7543,16919,37912,84968,190457,

%T 426841,956698,2144238,4805827,10771315,24141588,54108332,121272549,

%U 271806901,609198390,1365390546,3060236911,6858880431,15372743856,34454786384,77223188593,173079605553,387921692082,869445237846

%N Diagonal sums of number triangle A184883.

%H <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (1,2,2,-1,1).

%F G.f.: (1-x^2)/(1-x-2x^2-2x^3+x^4-x^5).

%F a(n)=sum{k=0..floor(n/2), sum{j=0..k, C(2n-4k,j)*C(k,j)2^j}}.

%K nonn,easy

%O 0,3

%A _Paul Barry_, Jan 24 2011

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Last modified April 9 07:30 EDT 2020. Contains 333344 sequences. (Running on oeis4.)