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Search: id:A104470
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| 1, 1, 1, 9, 44, 270, 1938, 15764, 143776, 1453302, 16128420, 194980478, 2550746400, 35904118874, 541097840528, 8693290587030, 148324680742912, 2678504175897990, 51039398650102776, 1023458322628129882
(list; graph; listen)
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OFFSET
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0,4
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COMMENT
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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.
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FORMULA
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a(0) = a(1) = a(2) = 1; for n>2 a(n) = n*(a(n-1)+a(n-2)+a(n-3)).
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CROSSREFS
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Cf. A002467.
Sequence in context: A034558 A144109 A099867 this_sequence A084016 A125679 A037207
Adjacent sequences: A104467 A104468 A104469 this_sequence A104471 A104472 A104473
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KEYWORD
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easy,nonn
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AUTHOR
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Jonathan Vos Post (jvospost3(AT)gmail.com), Mar 09 2005
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