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 A028269 #8 Jul 02 2025 16:01:55 %S A028269 4,8,6,26,34,90,10,148,266,322,12,64,414,588,76,1002,1176,14,880,2178, %T A028269 430,4356,16,118,3718,6292,134,2184,10010,16302,18,936,3620,10388, %U A028269 22932,39832,55198,61490,20,188,4556,14008,33320,62764,95030,116688 %N A028269 Distinct even elements in 3-Pascal triangle A028262 (by row). %K A028269 nonn,tabf %O A028269 1,1 %A A028269 _Mohammad K. Azarian_ %E A028269 More terms from _James Sellers_