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4, 4, 9, 29, 119, 599, 3599, 25199, 201599, 1814399, 18143999, 199583999, 2395007999, 31135103999, 435891455999, 6538371839999, 104613949439999, 1778437140479999, 32011868528639999, 608225502044159999
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,1
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 0..200
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FORMULA
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a(n) = 5*A000142(n)-1.
a(0)=4, a(n) = n*a(n-1)+n-1. - Vincenzo Librandi, Sep 30 2013
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MATHEMATICA
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Table[5 n! - 1, {n, 0, 25}] (* Vincenzo Librandi, Sep 30 2013 *)
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PROG
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(MAGMA) [5*Factorial(n)-1: n in [0..25]]; /* or */ [4] cat [n eq 1 select n+3 else n*Self(n-1)+n-1: n in [1..25] ]; // Vincenzo Librandi, Sep 30 2013
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CROSSREFS
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Cf. sequences of the type k*n!-1: A033312 (k=1), A020543 (k=2), A173323 (k=3), A173321 (k=4), this sequence, A173316 (k=6).
Sequence in context: A089539 A117416 A174943 * A059811 A202409 A091016
Adjacent sequences: A173314 A173315 A173316 * A173318 A173319 A173320
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KEYWORD
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nonn,easy
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AUTHOR
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Vincenzo Librandi, Feb 16 2010
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EXTENSIONS
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a(16) corrected from Vincenzo Librandi, Sep 30 2013
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STATUS
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approved
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