id:A109222 - OEIS Search Results

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Row sums of a triangle related to the Fibonacci polynomials.

+0
3

1, 2, 3, 6, 11, 21, 40, 76, 145, 276, 526, 1002, 1909, 3637, 6929, 13201, 25150, 47915, 91286, 173915, 331337, 631252, 1202640, 2291229, 4365172, 8316378, 15844082, 30185609, 57508601, 109563441, 208736561, 397677834, 757642355, 1443434582 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Row sums of A109221.`
	FORMULA	`G.f.: (1+x-x^2-x^3)/(1-x-2x^2+x^4); a(n)=a(n-1)+2a(n-2)-a(n-4); a(n)=sum{k=0..n, binomial(floor((2n-k)/2)+n-k, 2n-2k)}.`
	CROSSREFS	`Sequence in context: A123915 A132832 A079116 this_sequence A006861 A052956 A008930` `Adjacent sequences: A109219 A109220 A109221 this_sequence A109223 A109224 A109225`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jun 22 2005`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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