OFFSET
0,3
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..150
Wikipedia, Stirling's Approximation
FORMULA
a(n) = ceiling(sqrt(2*Pi)*n^(n+(1/2))/e^n). - Wesley Ivan Hurt, Jun 11 2016
MAPLE
A005395:=n->ceil(sqrt(2*Pi)*n^(n+(1/2))/exp(1)^n): seq(A005395(n), n=0..30); # Wesley Ivan Hurt, Jun 11 2016
MATHEMATICA
Table[Ceiling[Sqrt[2*Pi]*n^(n + (1/2))/E^n], {n, 0, 20}] (* Wesley Ivan Hurt, Jun 11 2016 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
a(12) onwards corrected by Sean A. Irvine, Jun 11 2016
STATUS
approved