id:A078061 - OEIS Search Results

Search: id:A078061

Displaying 1-1 of 1 results found.

page 1

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

+0
1

1, -3, 6, -13, 29, -64, 141, -311, 686, -1513, 3337, -7360, 16233, -35803, 78966, -174165, 384133, -847232, 1868629, -4121391, 9090014, -20048657, 44218705, -97527424, 215103505, -474425715, 1046378854, -2307861213, 5090148141, -11226675136, 24761211485, -54612571111, 120451817358 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n)=(-1)^nsum{k=0..n, C(n-k,floor(k/2))2^(n-k-floor(k/2))}. [From Paul Barry (pbarry(AT)wit.ie), Oct 20 2009]`
	CROSSREFS	`Sequence in context: A106496 A052933 A071014 this_sequence A018909 A093128 A005313` `Adjacent sequences: A078058 A078059 A078060 this_sequence A078062 A078063 A078064`
	KEYWORD	`sign`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Nov 17 2002`

page 1

Search completed in 0.002 seconds

Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

AT&T Labs Research