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 A028267 #9 Jul 02 2025 16:01:55 %S A028267 1,3,4,5,8,6,13,7,19,26,45,9,34,71,90,10,43,105,161,11,53,148,266,322, %T A028267 12,64,201,414,588,76,265,615,1002,1176,14,89,341,880,1617,2178,15, %U A028267 103,430,1221,2497,3795,4356,16,118,533,1651,3718,6292,8151,17,134,651 %N A028267 Number of distinct elements in 3-Pascal triangle A028262 (by row). %K A028267 nonn,easy,tabf %O A028267 0,2 %A A028267 _Mohammad K. Azarian_ %E A028267 More terms from _James Sellers_