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A085456 Sum(Sum a(j)a(i-j),(j=0,..,i)),(i=0,..,n)=(-7)^n. 0

%I

%S 1,-4,20,-116,708,-4452,28532,-185300,1215268,-8030404,53381844,

%T -356577588,2391430020,-16092704292,108605848116,-734783381652,

%U 4982063186916,-33844621986180,230306722637204,-1569571734301172,10711405584991300,-73188920628617956,500643475619050740

%N Sum(Sum a(j)a(i-j),(j=0,..,i)),(i=0,..,n)=(-7)^n.

%F G.f.: A(x)=Sqrt((1-x)/(1+7x))

%t CoefficientList[Series[Sqrt[(1-x)/(1+7 x)], {x, 0, 30}], x]

%K easy,sign

%O 0,2

%A Mario Catalani (mario.catalani(AT)unito.it), Jul 01 2003

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Last modified October 21 13:19 EDT 2021. Contains 348155 sequences. (Running on oeis4.)