id:A106202 - OEIS Search Results

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

+0
2

0, 0, 0, 2, 4, 6, 8, 2, -20, -66, -144, -230, -236, 22, 856, 2610, 5308, 7918, 7104, -4150, -36636, -100794, -193368, -269342, -198772, 274974, 1522192, 3846778, 6966452 (list; graph; listen)

	OFFSET	`0,4`
	COMMENT	`Real part is A106202.`
	FORMULA	`G.f.: x^3/(1-2x+x^2+4x^4); a(n)=sum{k=0..floor((n-1)/2), C(n-k-1, k)2^ksin(pi*k/2)}.`
	CROSSREFS	`Cf. A104862, A014292, A001045.` `Sequence in context: A004519 A036839 A004093 this_sequence A064745 A115425 A116418` `Adjacent sequences: A106199 A106200 A106201 this_sequence A106203 A106204 A106205`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Apr 25 2005`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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