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 A349263 #6 Nov 23 2021 09:02:23 %S A349263 1,1,8,128,3522,152166,9493504,806453248,89434106370,12547916380814, %T A349263 2173051605252096,455304058354270208,113519427904851374434 %N A349263 Main diagonal of A349271. %Y A349263 Cf. A349271. %K A349263 nonn,more %O A349263 1,3 %A A349263 _Peter Luschny_, Nov 23 2021