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A174299 a(n) = floor(n!*exp(-n)). 1

%I #15 Sep 08 2022 08:45:51

%S 1,0,0,0,0,0,1,4,13,44,164,666,2943,14075,72491,400020,2354549,

%T 14725237,97508021,681552735,5014584787,38740015633,313536416649,

%U 2652902840111,23422761943259,215418814359446,2060451979153567,20465943911593383,210812000258805578,2249048624575857158,24821362535291019333

%N a(n) = floor(n!*exp(-n)).

%p A174299:=n->floor(n!*exp(-n)): seq(A174299(n), n=0..30); # _Wesley Ivan Hurt_, Aug 20 2015

%t Table[Floor[n!*Exp[ -n]], {n, 0, 20}]

%o (PARI) first(m)=vector(m, i, i--; floor(i!/exp(i))) \\ _Anders Hellström_, Aug 20 2015

%o (Magma) [Floor(Factorial(n) / (Exp(n))): n in [0..40]]; // _Vincenzo Librandi_, Aug 21 2015

%K nonn,easy

%O 0,8

%A _Roger L. Bagula_, Mar 15 2010

%E Notation standardized by the Assoc. Eds. of the OEIS, Mar 31 2010

%E Added more terms and prepended terms a(0)..a(5), _Joerg Arndt_, Aug 13 2015

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Last modified April 25 08:27 EDT 2024. Contains 371964 sequences. (Running on oeis4.)