id:A085573 - OEIS Search Results

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2*Sum(floor(C(n,w)/w),w=1..n/2-1)+floor(C(n,n/2)/(n/2)) if n is even, otherwise 2*Sum(floor(C(n,w)/w),w=1..(n-1)/2).

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2, 6, 11, 20, 32, 56, 97, 172, 298, 534, 952, 1736, 3150, 5824, 10724, 20042, 37308, 70304, 131971, 250308, 473020, 901872, 1713596, 3281122, 6262254, 12033330, 23053047, 44431308, 85393280, 165008114, 318009610, 615878180, 1189803926, 2308781688 (list; graph; listen)

	OFFSET	`2,1`
	MAPLE	`b := binomial; f3 := n->if n mod 2 = 0 then 2add(floor(b(n, w)/w), w=1..n/2-1)+floor(b(n, n/2)/(n/2)); else 2add(floor(b(n, w)/w), w=1..(n-1)/2); fi;`
	CROSSREFS	`Cf. A085568-A086672.` `Sequence in context: A163324 A048204 A058760 this_sequence A081691 A085571 A007684` `Adjacent sequences: A085570 A085571 A085572 this_sequence A085574 A085575 A085576`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Jul 07 2003`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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