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 A110130 #6 Mar 19 2017 00:09:25 %S A110130 1,0,2,4,22,136,504,5136,16966,240368,752800,13660480,41492284, %T A110130 918172848,2734083968,71399743744,209681631814,6312095369056, %U A110130 18348172005888,625558677709824,1804161160185748,68713071248064560 %N A110130 Central coefficients of a scaled Legendre triangle. %C A110130 Central coefficients of triangle A110124. %F A110130 a(n)=2^ceiling(n/2)*LegendreP(ceiling(n/2), floor(n/2)); %o A110130 (PARI) a(n)=2^ceil(n/2)*pollegendre(ceil(n/2), n\2) \\ _Charles R Greathouse IV_, Mar 19 2017 %K A110130 easy,nonn %O A110130 0,3 %A A110130 _Paul Barry_, Jul 13 2005