id:A099838 - OEIS Search Results

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

+0
2

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

	OFFSET	`0,2`
	COMMENT	`Partial sums are A099837.`
	FORMULA	`a(n)=sum{k=0..n, (cos(2pi(n-k)/3)+sin(2pi(n-k)/3)/sqrt(3))C(2, k)(-1)^k}`
	CROSSREFS	`Sequence in context: A087985 A004557 A088276 this_sequence A127449 A138057 A053727` `Adjacent sequences: A099835 A099836 A099837 this_sequence A099839 A099840 A099841`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Oct 27 2004`

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Last modified November 21 14:49 EST 2008. Contains 150807 sequences.

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