A128419 - OEIS

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A128419

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

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

	OFFSET	`0,2`
	COMMENTS	`Diagonal sums of number triangle A128417.`
	FORMULA	`a(n)=sum{k=0..floor(n/2), 2^(n-2k)*C(2n-2k,n-2k)}`
	CROSSREFS	`Sequence in context: A073517 A184755 A074422 * A006880 A175255 A081068` `Adjacent sequences: A128416 A128417 A128418 * A128420 A128421 A128422`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 02 2007`

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Last modified February 14 20:38 EST 2012. Contains 205663 sequences.