id:A123879 - OEIS Search Results

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Expansion of (1-2x+2x^2-x^3)/(1-3x+5x^2-3x^3+x^4).

+0
2

1, 1, 0, -3, -7, -7, 5, 32, 57, 33, -95, -311, -416, -11, 1209, 2745, 2573, -2368, -12943, -22015, -11007, 40593, 123712, 157165, -14279, -498119, -1075179, -934944, 1090985, 5220257, 8476193, 3535193, -17205600 (list; graph; listen)

	OFFSET	`0,4`
	COMMENT	`Row sums of number triangle A123878.`
	FORMULA	`a(n)=sum{k=0..n, sum{j=0..n, C(n+j,2j)C(j+k,2k)*(-1)^(j-k)}}`
	CROSSREFS	`Sequence in context: A021269 A021730 A019634 this_sequence A081522 A020764 A010625` `Adjacent sequences: A123876 A123877 A123878 this_sequence A123880 A123881 A123882`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Oct 16 2006`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research