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 A050145 #5 Mar 30 2012 18:57:01
%S A050145 0,1,0,2,1,1,5,4,5,1,14,14,20,7,1,42,48,75,35,9,1,132,165,275,154,54,
%T A050145 11,1,429,572,1001,637,273,77,13,1,1430,2002,3640,2548,1260,440,104,
%U A050145 15,1,4862,7072,13260,9996,5508,2244,663,135,17,1
%N A050145 T(n,k)=M(2n,n-1,k-1), 0<=k<=n, n >= 0, array M as in A050144.
%C A050145 First 7 columns of T are A000108, A002057, A000344, A000588, A001392, A000589, A000590.
%e A050145 Rows: {0}; {1,0}; {2,1,1}; ...
%K A050145 nonn,tabl
%O A050145 0,4
%A A050145 _Clark Kimberling_