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 A291889 #7 Sep 09 2017 12:44:41 %S A291889 1,5,29,127,540,2117,8063,29688,107237,380549,1333709,4624308, %T A291889 15899625,54278502,184209808,622029353,2091461574,7006165827, %U A291889 23394683289,77899483723,258750654760,857596024194,2836911700038,9368339478043,30889646001696,101710568454396 %N A291889 Number of symmetrically unique Dyck paths of semilength n and height five. %H A291889 Alois P. Heinz, <a href="/A291889/b291889.txt">Table of n, a(n) for n = 5..1000</a> %H A291889 <a href="/index/Rec#order_10">Index entries for linear recurrences with constant coefficients</a>, signature (10, -33, 20, 113, -234, 66, 224, -240, 84, -9). %F A291889 G.f.: -x^5*(18*x^3-14*x^4+3*x^5-12*x^2+5*x-1) / ((x-1) *(3*x-1) *(3*x^2-1) *(x^3-2*x^2-x+1) *(x^3-6*x^2+5*x-1)). %Y A291889 Column k=5 of A291883. %K A291889 nonn,easy %O A291889 5,2 %A A291889 _Alois P. Heinz_, Sep 05 2017