This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A212459 #19 Jan 20 2024 11:27:53
%S A212459 2,6,11,17,24,30,37,45,53,60,69,77,85,94,103,111,120,130,139,148,157,
%T A212459 167,177,186,196,206,216,226,236,246,256,267,277,287,298,308,319,330,
%U A212459 340,351,362,373,384,395,405,417,428
%N A212459 a(n) = ceiling(2n*log(2n)).
%H A212459 Vincenzo Librandi, <a href="/A212459/b212459.txt">Table of n, a(n) for n = 1..1000</a>
%F A212459 a(n) = A050502(2*n). - _Michel Marcus_, Jan 11 2016
%t A212459 Table[Ceiling[2*n*Log[2*n]], {n, 80}] (* _Vincenzo Librandi_, Feb 13 2013 *)
%o A212459 (Derive) PROG(y := [], x := 100, LOOP(IF(x = 0, RETURN y), y := ADJOIN(CEILING(2·x·LOG(2·x)), y), x := x - 1))
%o A212459 (Magma) [Ceiling(2*n*Log(2*n)): n in [1..80]]; // _Vincenzo Librandi_, Feb 13 2013
%o A212459 (PARI) a(n) = ceil(2*n*log(2*n)); \\ _Michel Marcus_, Jan 11 2016
%Y A212459 Cf. A050502, A050504, A212455, A212456, A212457, A212458, A212460, A212461, A212462.
%K A212459 easy,nonn
%O A212459 1,1
%A A212459 _Mohammad K. Azarian_, May 31 2012