id:A085696 - OEIS Search Results

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a(n) = L(n) L(n+1) L(n+2) / 2, where L(n) = Lucas number (A000032).

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3, 6, 42, 154, 693, 2871, 12267, 51794, 219678, 930126, 3940797, 16692319, 70711683, 299536446, 1268861682, 5374976354, 22768778133, 96450071031, 408569091147, 1730726388874, 7331474722278, 31056625155606 (list; graph; listen)

	OFFSET	`0,1`
	FORMULA	`G.F. : ( 3 - 3 x + 6 x^2 + x^3 )/( 1 - 3 x - 6 x^2 + 3 x^3 + x^4 ) Recurrence: a(n+4) = 3 a(n+3) + 6 a(n+2) - 3 a(n+1) - a(n)`
	CROSSREFS	`Sequence in context: A000222 A104271 A109491 this_sequence A079095 A002028 A116315` `Adjacent sequences: A085693 A085694 A085695 this_sequence A085697 A085698 A085699`
	KEYWORD	`easy,nonn`
	AUTHOR	`Emanuele Munarini (munarini(AT)mate.polimi.it), Jul 18 2003`

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Last modified July 24 12:00 EDT 2008. Contains 142294 sequences.

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