id:A083650 - OEIS Search Results

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Euler transform of period 16 sequence [ -1,2,1,-2,1,1,-1,-3,-1,1,1,-2,1,2,-1,-2,...].

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1, -1, 2, -1, 0, 2, -1, 0, 0, -2, -1, 2, -2, 0, -2, 1, 0, 2, 0, -2, 0, 1, 0, 0, -2, 0, 0, 0, -1, -2, 2, 0, 2, 0, 0, 2, 3, 0, 0, -2, 0, 0, -2, 0, 2, -1, 2, 0, 0, 0, 2, -2, 0, -2, 2, 1, -2, 2, 0, 0, 0, 0, 0, 0, 0, 2, -1, 0, 0, 0, 0, -2, 2, 0, -2, 2, 0, -2, -1, 0, -2, 0, -2, 0, -2, 0, 0, 4, 0, 0, 0 (list; graph; listen)

	OFFSET	`0,3`
	PROGRAM	`(PARI) a(n)=if(n<0, 0, X=x+xO(x^n); (-1)^(n\2)polcoeff(eta(X)*eta(X^2), n))`
	CROSSREFS	`Cf. A030204(n)=(-1)^[n/2]a(n).` `Adjacent sequences: A083647 A083648 A083649 this_sequence A083651 A083652 A083653` `Sequence in context: A067613 A058531 A093073 this_sequence A030204 A138514 A143540`
	KEYWORD	`sign`
	AUTHOR	`Michael Somos, May 01 2003`

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Last modified October 15 09:18 EDT 2008. Contains 145015 sequences.

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