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 A067092 #8 Mar 11 2019 12:18:34
%S A067092 2,3,49,6540,8176,9814,11451,13088,14725,16362,17999,19636,21273,
%T A067092 22910,24547,26184,27821,29458,31095,32732,34369,36006,37643,39280,
%U A067092 40917,4217902,438013252,45423626657,4704592803725,486682294165577
%N A067092 a(n) = floor(X/Y) where X = concatenation in decreasing order of (2n)-th even number to (n+1)-th even number and Y = that of first n even numbers in increasing order.
%H A067092 Harvey P. Dale, <a href="/A067092/b067092.txt">Table of n, a(n) for n = 0..1000</a>
%e A067092 a(3) = floor[12108/246] = 49. a(8) = floor [ 3230282624222018/246810121416] = floor[13088.128662184629278356029087656] = 13088.
%t A067092 Table[Floor[FromDigits[Flatten[IntegerDigits/@Range[4n,2n+2,-2]]]/ FromDigits[ Flatten[IntegerDigits/@Range[2,2n,2]]]],{n,30}] (* _Harvey P. Dale_, Mar 11 2019 *)
%Y A067092 Cf. A067088, A067089, A067090, A067091.
%K A067092 easy,nonn,base
%O A067092 0,1
%A A067092 _Amarnath Murthy_, Jan 07 2002
%E A067092 More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 01 2003
%E A067092 Edited by _Charles R Greathouse IV_, Apr 23 2010