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A085456 Sum(Sum a(j)a(i-j),(j=0,..,i)),(i=0,..,n)=(-7)^n. 0
1, -4, 20, -116, 708, -4452, 28532, -185300, 1215268, -8030404, 53381844, -356577588, 2391430020, -16092704292, 108605848116, -734783381652, 4982063186916, -33844621986180, 230306722637204, -1569571734301172, 10711405584991300, -73188920628617956, 500643475619050740 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..22.

FORMULA

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

MATHEMATICA

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

CROSSREFS

Sequence in context: A106567 A077445 A085458 * A120915 A165311 A100328

Adjacent sequences:  A085453 A085454 A085455 * A085457 A085458 A085459

KEYWORD

easy,sign

AUTHOR

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

STATUS

approved

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Last modified September 24 11:57 EDT 2021. Contains 347642 sequences. (Running on oeis4.)