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 A233533 #7 Mar 25 2025 14:50:19 %S A233533 1,3,9,40,264,2379,27568,392895,6663624,131211423,2943137604, %T A233533 74087543634,2068127523264,63395972293650,2116776180704988, %U A233533 76462961271015326,2970720383283042732,123517218432709179030,5472063213488927240290,257315864404023900340860,12799687840583182179921204 %N A233533 Third column of triangle A233530. %Y A233533 Cf. A233530, A233531, A233532, A233534, A233535. %K A233533 nonn %O A233533 1,2 %A A233533 _Paul D. Hanna_, Dec 14 2013