A124745 - OEIS

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A124745

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

1, 1, 1, 0, 0, -1, 0, -1, 1, -1, 2, -2, 3, -4, 5, -7, 9, -12, 16, -21, 28, -37, 49, -65, 86, -114, 151, -200, 265, -351, 465, -616, 816, -1081, 1432, -1897, 2513, -3329, 4410, -5842, 7739, -10252, 13581, -17991, 23833, -31572 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,11`
	COMMENTS	`Row sums of A124744.`
	LINKS	`Index to sequences with linear recurrences with constant coefficients, signature (0,1,-1).`
	FORMULA	`a(n)=sum{k=0..n, C(floor(k/2),n-k)(-1)^(n-k)} = (-1)^nA078027(n).`
	CROSSREFS	`Cf. A078027.` `Sequence in context: A117298 A018052 A018124 * A133034 A000931 A078027` `Adjacent sequences: A124742 A124743 A124744 * A124746 A124747 A124748`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Nov 06 2006`

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Last modified February 15 03:22 EST 2012. Contains 205694 sequences.