id:A085455 - OEIS Search Results

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Sum(Sum a(j)a(i-j),(j=0,..,i)),(i=0,..,n)=(-3)^n.

+0
3

1, -2, 4, -10, 26, -70, 192, -534, 1500, -4246, 12092, -34606, 99442, -286730, 829168, -2403834, 6984234, -20331558, 59287740, -173149662, 506376222, -1482730098, 4346486256, -12754363650, 37461564504, -110125172682, 323990062452, -953883382354, 2810310510110, -8284915984726 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`G.f.: A(x)=Sqrt((1-x)/(1+3x))`
	MATHEMATICA	`CoefficientList[Series[Sqrt[(1-x)/(1+3x)], {x, 0, 30}], x]`
	CROSSREFS	`Absolute values are in A025565.` `Sequence in context: A081881 A134773 A025565 this_sequence A055226 A097085 A071962` `Adjacent sequences: A085452 A085453 A085454 this_sequence A085456 A085457 A085458`
	KEYWORD	`easy,sign`
	AUTHOR	`Mario Catalani (mario.catalani(AT)unito.it), Jul 01 2003`

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

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