id:A128419 - OEIS Search Results

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Expansion of 8/(sqrt(1-8x)(sqrt(1-8x)+4x+7)).

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1, 4, 25, 168, 1181, 8524, 62609, 465616, 3495013, 26423604, 200920985, 1534936440, 11771854381, 90578698396, 698921030945, 5406132020128, 41905249405301, 325434733291396, 2531523208218665, 19721766268370248 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Diagonal sums of number triangle A128417.`
	FORMULA	`a(n)=sum{k=0..floor(n/2), 2^(n-2k)*C(2n-2k,n-2k)}`
	CROSSREFS	`Adjacent sequences: A128416 A128417 A128418 this_sequence A128420 A128421 A128422` `Sequence in context: A079750 A073517 A074422 this_sequence A006880 A081068 A163072`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 02 2007`

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Last modified November 9 12:23 EST 2009. Contains 166233 sequences.

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