A078066 - OEIS

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A078066

Expansion of (1-x)/(1+2*x+x^2+2*x^3).

1, -3, 5, -9, 19, -39, 77, -153, 307, -615, 1229, -2457, 4915, -9831, 19661, -39321, 78643, -157287, 314573, -629145, 1258291, -2516583, 5033165, -10066329, 20132659, -40265319, 80530637, -161061273, 322122547, -644245095, 1288490189, -2576980377, 5153960755, -10307921511 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`a(n)=(-1)^n(J(n+1)+2sum{k=0..floor((n-1)/2), (-1)^k*J(n-2k)}) where J(n)=A001045(n); - Paul Barry (pbarry(AT)wit.ie), Oct 12 2007`
	CROSSREFS	`Sequence in context: A032385 A192230 A071384 * A018002 A192480 A107028` `Adjacent sequences: A078063 A078064 A078065 * A078067 A078068 A078069`
	KEYWORD	`sign`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Nov 17 2002`

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Last modified February 15 18:57 EST 2012. Contains 205848 sequences.