id:A097342 - OEIS Search Results

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Sum k=0..floor(n/2), Stirling2(n-k,k)3^k.

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1, 0, 3, 3, 12, 30, 93, 300, 1038, 3810, 14781, 60375, 258807, 1160949, 5435652, 26502555, 134282406, 705720549, 3840542031, 21608662710, 125523530724, 751831408929, 4637611255422, 29428408797852, 191907975348210 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(n)=sum{k=0..floor(n/2), sum{i=0..k, (-1)^(k+i)i^(n-k)/(i!(k-i)!)}3^k }`
	CROSSREFS	`Cf. A024427, A097341.` `Sequence in context: A006804 A052533 A136533 this_sequence A025236 A014432 A107330` `Adjacent sequences: A097339 A097340 A097341 this_sequence A097343 A097344 A097345`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Aug 05 2004`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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