id:A057077 - OEIS Search Results

Search: id:A057077

Displaying 1-1 of 1 results found.

page 1

Periodic sequence 1,1,-1,-1...; expansion of (1+x)/(1+x^2).

+0
9

1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1 (list; graph; listen)

	OFFSET	`0,1`
	LINKS	`Index entries for sequences related to Chebyshev polynomials.`
	FORMULA	`a(n)=S(n, 0)+S(n-1, 0) = S(2n, sqrt(2)); S(n, x) := U(n, x/2), Chebyshev polynomials of 2nd kind, A049310. S(n, 0)=A056594.` `G.f.: (1+x)/(1+x^2).` `a(n)=cos(nPi/2)+sin(n*Pi/2) with n>=0 - Paolo P. Lava (ppl(AT)spl.at), Jun 12 2006`
	CROSSREFS	`\|a(n)\|=A000012. Cf. A049310.` `Adjacent sequences: A057074 A057075 A057076 this_sequence A057078 A057079 A057080` `Sequence in context: A098417 A076479 A033999 this_sequence A063747 A077008 A087960`
	KEYWORD	`easy,sign`
	AUTHOR	`Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Aug 04 2000`

page 1

Search completed in 0.002 seconds

Last modified May 16 19:35 EDT 2008. Contains 139737 sequences.

AT&T Labs Research