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 A028266 #8 Jul 02 2025 16:01:55 %S A028266 4,4,8,6,6,26,8,26,26,8,34,90,34,10,10,148,266,322,266,148,12,64,414, %T A028266 588,588,414,64,12,76,1002,1176,1002,76,14,880,2178,2178,880,14,430, %U A028266 4356,430,16,118,3718,6292,6292,3718,118,16,134,2184,10010,16302,10010 %N A028266 Even elements in 3-Pascal triangle A028262 (by row). %K A028266 nonn,easy %O A028266 0,1 %A A028266 _Mohammad K. Azarian_ %E A028266 More terms from _James Sellers_