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 A045886 #1 Dec 11 1999 03:00:00 %S A045886 1,4,13,121,364,1093,3280,9841,29524,88573,265720,797161,2391484, %T A045886 7174453 %N A045886 Erroneous version of A003462. %K A045886 dead %O A045886 1,2