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 A383456 #7 May 03 2025 20:48:53 %S A383456 3,16,70,288,1155,4576,18018,70720,277134,1085280,4249388,16640960, %T A383456 65189475,255487680,1001800650,3930284160,15427730010,60591880800, %U A383456 238098549780,936100651200,3682173186510,14490838080576,57053452670100,224729967000448,885568808835900,3491063797713856,13767643081368792,54315062063687040,214354554086311331 %N A383456 a(n) = 2*binomial(2*n+4,n)*(n+3)/(n+2). %C A383456 Conjectured to be column 1 of the array in A383453. %Y A383456 Cf. A383453. %K A383456 nonn,more %O A383456 0,1 %A A383456 _N. J. A. Sloane_, May 02 2025