id:A106201 - OEIS Search Results

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Expansion of Re(x/(1-x-2ix^2)), i=sqrt(-1).

+0
1

0, 1, 1, 1, 1, -3, -11, -23, -39, -43, -3, 129, 417, 877, 1349, 1305, -407, -5627, -16243, -32079, -46287, -37987, 35285, 236873, 623609, 1162293, 1559837, 1009889, -2034495, -9728051 (list; graph; listen)

	OFFSET	`0,6`
	COMMENT	`Imaginary part is A106202.`
	FORMULA	`G.f.: x(1-x)/(1-2x+x^2+4x^4); a(n)=sum{k=0..floor((n-1)/2), C(n-k-1, k)2^kcos(pi*k/2)}.`
	CROSSREFS	`Cf. A104862, A014292.` `Adjacent sequences: A106198 A106199 A106200 this_sequence A106202 A106203 A106204` `Sequence in context: A094379 A072671 A119173 this_sequence A132209 A086497 A121509`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Apr 25 2005`

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Last modified October 6 16:13 EDT 2008. Contains 144667 sequences.

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