id:A124281 - OEIS Search Results

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

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1, 1, 3, 3, 9, 11, 29, 39, 93, 135, 301, 463, 981, 1575, 3213, 5327, 10565, 17943, 34845, 60255, 115189, 201895, 381453, 675375, 1264869, 2256503, 4198397, 7532415, 13945941, 25126983, 46350829, 83777743, 154117317, 279225111 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(n)=sum{k=0..floor(n/2), sum{j=0..n-2k, C(j,n-2k-j)C(k,n-2k-j)*2^k}}`
	CROSSREFS	`Cf. A124280.` `Sequence in context: A022156 A125027 A005296 this_sequence A117153 A045810 A066314` `Adjacent sequences: A124278 A124279 A124280 this_sequence A124282 A124283 A124284`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Oct 24 2006`

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Last modified September 6 16:04 EDT 2008. Contains 143483 sequences.

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