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Search: id:A006348
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| A006348 |
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a(n) = (n+2)*a(n-1) + (-1)^n.
(Formerly M3609)
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+0
1
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| 0, 1, 4, 25, 174, 1393, 12536, 125361, 1378970, 16547641, 215119332, 3011670649, 45175059734, 722800955745, 12287616247664, 221177092457953, 4202364756701106
(list; graph; listen)
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OFFSET
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1,3
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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MAPLE
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a:=n->n!*sum((-1)^k/k!, k=4..n): seq(a(n), n=3..19); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 25 2007
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CROSSREFS
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Sequence in context: A034494 A084210 A093683 this_sequence A051820 A166697 A054368
Adjacent sequences: A006345 A006346 A006347 this_sequence A006349 A006350 A006351
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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