id:A128017 - OEIS Search Results

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Expansion of (1+2x+x^2-x^3)/(1-x^2+x^4).

+0
4

1, 2, 2, 1, 1, -1, -1, -2, -2, -1, -1, 1, 1, 2, 2, 1, 1, -1, -1, -2, -2, -1, -1, 1, 1, 2, 2, 1, 1, -1, -1, -2, -2, -1, -1, 1, 1, 2, 2, 1, 1, -1, -1, -2, -2, -1, -1, 1, 1, 2, 2, 1, 1, -1, -1, -2, -2, -1, -1, 1, 1, 2, 2, 1, 1, -1, -1, -2, -2, -1, -1 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Hankel transform of A128014, A128015, A005717(n+1).`
	FORMULA	`a(n)=(1-sqrt(3)/2)cos(5pin/6+pi/3)-sin(5pin/6+pi/3)/2+cos(pin/6+pi/6)/2+(1+sqrt(3)/2)sin(pin/6+pi/6)` `a(n)=(1/12){-2[(n+1) mod 12]-[(n+3) mod 12]+[(n+5) mod 12]+2*[(n+7) mod 12]+[(n+9) mod 12]-[(n+11) mod 12]}, with n>=0. - Paolo P. Lava (ppl(AT)spl.at), Jun 01 2007`
	CROSSREFS	`Cf. A128016.` `Sequence in context: A138385 A030614 A128016 this_sequence A096285 A121561 A078772` `Adjacent sequences: A128014 A128015 A128016 this_sequence A128018 A128019 A128020`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Feb 11 2007`

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Last modified September 6 00:03 EDT 2008. Contains 143485 sequences.

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