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 A066912 #7 Apr 24 2022 17:19:38 %S A066912 0,1,26,302,2416,15619,88234,455192,2203488,10187685,45533450, %T A066912 198410786,848090912,3572085255,14875399450,61403313100,251732291184, %U A066912 1026509354985,4168403181210,16871482830550,68111623139600 %N A066912 Fourth column of the Eulerian triangle A008292 in square array format. %F A066912 a(n) = 4^(n+3) - (n+4)*3^(n+3) + (1/2)*(n+3)*(n+4)*2^(n+3) - (1/6)*(n+2)*(n+3)*(n+4). %o A066912 (PARI) a(n)=4^(n+3)-(n+4)*3^(n+3)+1/2*(n+3)*(n+4)*2^(n+3)-1/6*(n+2)*(n+3)*(n+4) %Y A066912 Essentially the same as A000498. %K A066912 nonn %O A066912 0,3 %A A066912 _Randall L Rathbun_, Jan 22 2002 %E A066912 More terms from Larry Reeves (larryr(AT)acm.org), Jun 11 2002