id:A122434 - OEIS Search Results

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Expansion of (1+x)^3/(1+x+x^2).

+0
2

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

	OFFSET	`0,2`
	COMMENT	`Row sums of number triangle A122433. Binomial transform is A077859.`
	FORMULA	`a(n)=2sqrt(3)cos(2pin/3+pi/6)/3+C(1,n)+C(0,n)` `a(n) = -A049347(n) if n>=2 . - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 08 2008`
	CROSSREFS	`Sequence in context: A116377 A131964 A065339 this_sequence A141571 A164067 A113706` `Adjacent sequences: A122431 A122432 A122433 this_sequence A122435 A122436 A122437`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Sep 04 2006`

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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.

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