A192004 - OEIS

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A192004

Alternating row sums of array A187360: minimal polynomial of 2*cos(pi/n) evaluated for x=-1.

1, -1, -2, -1, 1, -2, 1, -1, 1, 1, 1, -2, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, -2, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -2, 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; refs; listen; history; text; internal format)

	OFFSET	`1,3`
	LINKS	`Table of n, a(n) for n=1..80.`
	FORMULA	`a(n) = sum(((-1)^m)A187360(n,m),m=0..A055034(n)), n>=1.` `a(n) = C(n,x=-1), with the minimal (monic and integer) polynomial C(n,x) of 2cos(pi/n).`
	CROSSREFS	`Cf. A055034, A192003.` `Sequence in context: A183017 A183014 A030382 * A120889 A092523 A120891` `Adjacent sequences: A192001 A192002 A192003 * A192005 A192006 A192007`
	KEYWORD	`sign,easy`
	AUTHOR	`Wolfdieter Lang, Jul 14 2011`
	STATUS	`approved`

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Last modified June 19 09:12 EDT 2013. Contains 226401 sequences.