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 A026111 #3 Mar 30 2012 18:56:04 %S A026111 3,16,89,496,2795,15884,90909,523312,3026850,17577660,102425257, %T A026111 598575368,3506930635,20591787300,121145018325,713948286528, %U A026111 4214030403902,24907512574608,147403116947718 %N A026111 a(n) = T(2n-1,n), where T is the array defined in A026105. %K A026111 nonn %O A026111 2,1 %A A026111 _Clark Kimberling_