id:A049601 - OEIS Search Results

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a(n)=Sum{T(2i,n-2i): i=0,1,...,[ n/2 ]}, array T as in A049600.

+0
2

0, 0, 2, 3, 12, 25, 76, 182, 504, 1275, 3410, 8811, 23256, 60580, 159094, 415715, 1089648, 2850645, 7466468, 19541994, 51170460, 133951675, 350713222, 918141623, 2403786672, 6293097000, 16475700746, 43133687427, 112925875764 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`G.f.: (-x^3+2x^2)/[(1+x-x^2)(1-3x+x^2)].` `a(n) = (Fibonacci(2n)+(-1)^nFibonacci(n))/2. - Vladeta Jovovic (vladeta(AT)eunet.rs), Aug 30 2004`
	CROSSREFS	`Cf. A049602.` `Sequence in context: A130337 A084728 A099429 this_sequence A148060 A148061 A148062` `Adjacent sequences: A049598 A049599 A049600 this_sequence A049602 A049603 A049604`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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

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