id:A152174 - OEIS Search Results

Search: id:A152174

Displaying 1-1 of 1 results found.

page 1

a(n)=-2*a(n-1)+4*a(n-2), n>1 ; a(0)=1, a(1)=-4 .

+0
7

1, -4, 12, -40, 128, -416, 1344, -4352, 14080, -45568, 147456, -477184, 1544192, -4997120, 16171008, -52330496, 169345024, -548012032, 1773404160, -5738856448, 18571329536, -60098084864, 194481487872, -629355315200 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Signed version of A087206.`
	FORMULA	`G.f.: (1-2x)/(1+2x-4x^2). a(n)=Sum_{k, 0<=k<=n}A147703(n,k)(-5)^k. a(n)=(-1)^nA087206(n).` `a(n)=(1/2){[ -1-sqrt(5)]^n+[ -1+sqrt(5)]^n+(3/10)sqrt(5)*{[ -1-sqrt(5)]^n-[ -1+sqrt(5)]^n}, with n>=0 [From Paolo P. Lava (ppl(AT)spl.at), Dec 01 2008]`
	CROSSREFS	`Cf. A087206, A152163, A152166, A152167` `Sequence in context: A104525 A126986 A090576 this_sequence A087206 A081875 A102433` `Adjacent sequences: A152171 A152172 A152173 this_sequence A152175 A152176 A152177`
	KEYWORD	`sign`
	AUTHOR	`Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Nov 27 2008`

page 1

Search completed in 0.002 seconds

Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research