A111915 - OEIS

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A111915

Expansion of -x^2*(x-1)*(x^2-x+1)*(x+x^2+1)/(1-x^4+x^8).

0, 0, 1, -1, 1, -1, 2, -2, 1, -1, 1, -1, 0, 0, -1, 1, -1, 1, -2, 2, -1, 1, -1, 1, 0, 0, 1, -1, 1, -1, 2, -2, 1, -1, 1, -1, 0, 0, -1, 1, -1, 1, -2, 2, -1, 1, -1, 1, 0, 0, 1, -1, 1, -1, 2, -2, 1, -1, 1, -1, 0, 0, -1, 1, -1, 1, -2, 2, -1, 1, -1, 1, 0, 0, 1, -1, 1, -1, 2, -2, 1, -1, 1, -1, 0, 0, -1, 1, -1, 1, -2, 2, -1, 1, -1, 1, 0, 0, 1, -1 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,7`
	COMMENTS	`It appears that (a(n)) has period 24.`
	PROG	`4kbasesigcycsumseq[ + .5'i + .5j' + .5'ij' + .5e], sumtype: Y[8] = (int)Y[6] - (int)Y[7] + Y[8] + sum (internal program code); apart from initial term 0.`
	CROSSREFS	`Cf. A111912, A111913, A111914, A085846.` `Sequence in context: A004578 A051031 A181059 * A066520 A088526 A054535` `Adjacent sequences: A111912 A111913 A111914 * A111916 A111917 A111918`
	KEYWORD	`easy,sign`
	AUTHOR	`Creighton Dement (creighton.k.dement(AT)uni-oldenburg.de), Aug 20 2005`

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Last modified February 17 23:33 EST 2012. Contains 206085 sequences.