id:A085456 - OEIS Search Results

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

+0
1

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; listen)

	OFFSET	`0,2`
	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 this_sequence A120915 A165311 A100328` `Adjacent sequences: A085453 A085454 A085455 this_sequence A085457 A085458 A085459`
	KEYWORD	`easy,sign`
	AUTHOR	`Mario Catalani (mario.catalani(AT)unito.it), Jul 01 2003`

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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.

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