A093123 - OEIS

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A093123

Third binomial transform of Fib(3n-1) (A015448).

1, 4, 20, 120, 800, 5600, 40000, 288000, 2080000, 15040000, 108800000, 787200000, 5696000000, 41216000000, 298240000000, 2158080000000, 15616000000000, 112998400000000, 817664000000000, 5916672000000000, 42813440000000000 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`G.f.: (1-6x)/(1-10x+20x^2); a(n)=(5-sqrt(5))(5+sqrt(5))^n/10 + (5+sqrt(5))(5-sqrt(5))^n/10; a(n)=2^n*A093129(n).`
	CROSSREFS	`Cf. A000045.` `Sequence in context: A013197 A089498 A046729 * A092055 A187848 A001715` `Adjacent sequences: A093120 A093121 A093122 * A093124 A093125 A093126`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 23 2004`

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Last modified February 17 16:49 EST 2012. Contains 206058 sequences.