id:A097919 - OEIS Search Results

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a(1)=1; a(n+1) = sum{k=1 to n} a(k) a(ceiling(n/k)).

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1, 1, 2, 5, 13, 35, 92, 246, 646, 1705, 4475, 11755, 30790, 80738, 211424, 553780, 1449999, 3796903, 9940710, 26027151, 68140743, 178399767, 467059142, 1222789414, 3201309100, 8381170779, 21942203523, 57445520528, 150394362117, 393737778753, 1030818974142 (list; graph; listen)

	OFFSET	`1,3`
	MAPLE	`f:=proc(n) option remember; local k; if n = 1 then RETURN(1); fi; add( f(k)*f(ceil((n-1)/k)), k=1..n-1 ); end;`
	CROSSREFS	`Cf. A097417.` `Sequence in context: A112839 A137674 A048781 this_sequence A160438 A054657 A024576` `Adjacent sequences: A097916 A097917 A097918 this_sequence A097920 A097921 A097922`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), following a suggestion of Benoit Cloitre, Sep 03 2004`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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