A104470 - OEIS

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A104470

Tribonacci-equivalent of mousetrap sequence (A002467).

1, 1, 1, 9, 44, 270, 1938, 15764, 143776, 1453302, 16128420, 194980478, 2550746400, 35904118874, 541097840528, 8693290587030, 148324680742912, 2678504175897990, 51039398650102776, 1023458322628129882 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,4`
	COMMENTS	`The mousetrap sequence (A002467) can be defined in a Fibonacci-like way as: a(0) = a(1) = 1; for n>1 a(n) = n*(a(n-1)+a(n-2)). The current sequence is thus the tribonacci-equivalent of that.`
	LINKS	`Table of n, a(n) for n=0..19.`
	FORMULA	`a(0) = a(1) = a(2) = 1; for n>2 a(n) = n*(a(n-1)+a(n-2)+a(n-3)).`
	CROSSREFS	`Cf. A002467.` `Sequence in context: A034558 A144109 A099867 * A084016 A221508 A125679` `Adjacent sequences: A104467 A104468 A104469 * A104471 A104472 A104473`
	KEYWORD	`easy,nonn`
	AUTHOR	`Jonathan Vos Post, Mar 09 2005`
	STATUS	`approved`

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Last modified May 22 23:20 EDT 2013. Contains 225585 sequences.