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A024469 a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n+1-k), where k = [ (n+1)/2 ], s = (Lucas numbers). 0

%I

%S 1,3,13,19,48,79,176,283,580,940,1844,2982,5667,9171,17047,27581,

%T 50404,81557,147090,237995,424686,687158,1215528,1966764,3453733,

%U 5588259,9752641

%N a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n+1-k), where k = [ (n+1)/2 ], s = (Lucas numbers).

%F Conjecture: G.f.: -x*(1+2*x+7*x^2-x^3-4*x^4+2*x^5) / ( (x^2+1) *(x^2-x-1) *(x^2+x-1)^2 ). - _R. J. Mathar_, Apr 27 2020

%K nonn

%O 1,2

%A _Clark Kimberling_

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Last modified July 28 17:15 EDT 2021. Contains 346335 sequences. (Running on oeis4.)