id:A134184 - OEIS Search Results

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A transform of the central binomial coefficients A001405.

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1, 1, 3, 7, 17, 43, 109, 279, 721, 1871, 4881, 12783, 33585, 88495, 233745, 618719, 1640833, 4358719, 11595841, 30890751, 82391297, 219995007, 588004737, 1573072383, 4211960065, 11286490879, 30265474305 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Hankel transform is A134185.`
	FORMULA	`G.f.: g(x(1+x)) where g(x) is the g.f. of A001405; a(n)=sum{k=0..n, binomial(k,n-k)binomial(k,floor(k/2))}; a(n)=sum{k=0..floor(n/2), binomial(n-k,k)binomial(n-k,floor((n-k)/2))};`
	CROSSREFS	`Sequence in context: A020730 A003440 A102071 this_sequence A142975 A114589 A078679` `Adjacent sequences: A134181 A134182 A134183 this_sequence A134185 A134186 A134187`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Oct 11 2007`

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Last modified December 4 21:35 EST 2008. Contains 151309 sequences.

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