id:A131969 - OEIS Search Results

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A131969

First differences of A020806.

+0
2

3, -2, 6, -3, 2, -6, 3, -2, 6, -3, 2, -6, 3, -2, 6, -3, 2, -6, 3, -2, 6, -3, 2, -6, 3, -2, 6, -3, 2, -6, 3, -2, 6, -3, 2, -6, 3, -2, 6, -3, 2, -6, 3, -2, 6, -3, 2, -6, 3, -2, 6, -3, 2, -6, 3, -2, 6, -3, 2, -6, 3, -2, 6, -3, 2, -6, 3, -2, 6, -3, 2, -6, 3, -2, 6, -3, 2, -6 (list; graph; listen)

	OFFSET	`0,1`
	FORMULA	`a(n)=(1/6){-9(n mod 6)+8[(n+1) mod 6]-5[(n+2) mod 6]+9[(n+3) mod 6]-8[(n+4) mod 6]+5[(n+5) mod 6]}, with n>=0 - Paolo P. Lava (ppl(AT)spl.at), Oct 10 2007` `a(n)=11(-1)^n/3-2A010892(n)/3+7A010892(n-1)/3, n>0. a(n+6)=a(n). G.f.: (3-2x+6x^2)/((1+x)(1-x+x^2)). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 24 2008]`
	CROSSREFS	`Sequence in context: A092843 A078589 A077880 this_sequence A058971 A137324 A011209` `Adjacent sequences: A131966 A131967 A131968 this_sequence A131970 A131971 A131972`
	KEYWORD	`sign`
	AUTHOR	`Paul Curtz (bpcrtz(AT)free.fr), Oct 06 2007`

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Last modified December 3 01:16 EST 2008. Contains 151161 sequences.

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