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Round((2*n+1/n)^n)
1

%I #8 Sep 08 2022 08:45:59

%S 3,20,254,4633,110408,3243618,113177496,4570858599,209655304353,

%T 10763674952098,611433842280388,38071427445729200,2578294348444597267,

%U 188670154792420320214,14834716200104606205407,1247263229999781126495328,111661618863544248806155259

%N Round((2*n+1/n)^n)

%H Vincenzo Librandi, <a href="/A197975/b197975.txt">Table of n, a(n) for n = 1..300</a>

%t Table[Round[(2n+1/n)^n],{n,20}] (* _Harvey P. Dale_, May 28 2018 *)

%o (Magma) [Round((2*n+1/n)^n): n in [1..20]]

%Y Cf. A014056

%K nonn

%O 1,1

%A _Vincenzo Librandi_, Oct 20 2011

%E Corrected and extended by _Harvey P. Dale_, May 28 2018