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 A026817 #17 Feb 08 2025 19:32:39 %S A026817 6,23,51,90,140,201,273,356,450,555,671,798,936,1085,1245,1416,1598, %T A026817 1791,1995,2210,2436,2673,2921,3180,3450,3731,4023,4326,4640,4965, %U A026817 5301,5648,6006,6375,6755,7146,7548,7961,8385,8820,9266,9723,10191 %N A026817 Duplicate of A022269. %K A026817 dead %O A026817 1,1