id:A098575 - OEIS Search Results

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Sum C(n-2k,2k)2^k, k=0..floor(n/4).

+0
3

1, 1, 1, 1, 3, 7, 13, 21, 35, 63, 117, 213, 379, 671, 1197, 2149, 3859, 6911, 12357, 22101, 39563, 70847, 126845, 227045, 406371, 727391, 1302101, 2330901, 4172443, 7468767, 13369293, 23931621, 42838835, 76683583, 137266917, 245713493 (list; graph; listen)

	OFFSET	`0,5`
	FORMULA	`G.f.: (1-x)/((1-x)^2-2x^4); a(n)=2a(n-1)-a(n-2)+2a(n-4).`
	CROSSREFS	`Cf. A007909, A098576.` `Sequence in context: A098577 A004136 A060939 this_sequence A138035 A032606 A098482` `Adjacent sequences: A098572 A098573 A098574 this_sequence A098576 A098577 A098578`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Sep 16 2004`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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