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 A054149 #8 Feb 11 2015 12:12:45 %S A054149 1,14,84,410,1820,7648,31008,122584,475600,1818656,6874560,25742624, %T A054149 95645888,353032960,1295729664,4732541824,17211685120,62362187264, %U A054149 225201546240,810825419264,2911520685056,10429433085952 %N A054149 T(2n-1,n), array T as in A054144. %F A054149 Conjectures from _Colin Barker_, Feb 11 2015: (Start) %F A054149 a(n) = 8*a(n-1)-20*a(n-2)+16*a(n-3)-4*a(n-4). %F A054149 G.f.: x*(2*x^3-8*x^2+6*x+1) / (2*x^2-4*x+1)^2. %F A054149 (End) %K A054149 nonn %O A054149 1,2 %A A054149 _Clark Kimberling_, Mar 18 2000