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 A047119 #7 Jan 27 2019 21:20:53 %S A047119 1,2,9,44,250,1418,8567,51635,321039,1996724,12628528,80011583, %T A047119 511889348,3282172599,21172582733,136879748346,888481523846, %U A047119 5778565689270,37689416642042,246245960185175,1612234572834084 %N A047119 T(2n,n), array T as in A047110. %K A047119 nonn %O A047119 0,2 %A A047119 _Clark Kimberling_; definition revised Dec 08 2006; sequence corrected Dec 18 2006