id:A097335 - OEIS Search Results

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

+0
3

1, 4, 4, 13, 49, 85, 202, 643, 1408, 3226, 9013, 21685, 50719, 131836, 327001, 783472, 1969996, 4913005, 11964253, 29694217, 73911262, 181589539, 448837492, 1114038850, 2748344701, 6787882129, 16814231779, 41549334088, 102640273249 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`G.f. : (1+3x)/(1-x-9x^3); a(n)=a(n-1)+9a(n-3).`
	CROSSREFS	`Cf. A097333, A097334, A097336.` `Sequence in context: A147824 A019081 A059443 this_sequence A117187 A138767 A048282` `Adjacent sequences: A097332 A097333 A097334 this_sequence A097336 A097337 A097338`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Aug 05 2004`

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

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