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 A028277 #8 Jul 02 2025 16:01:55 %S A028277 1,1,1,1,1,1,5,5,1,1,1,1,7,7,1,1,23,23,1,1,9,31,55,55,31,9,1,1,1,1,11, %T A028277 11,1,1,61,61,1,1,13,73,237,237,73,13,1,1,735,735,1,1,15,1045,1947, %U A028277 1947,1045,15,1,1,115,1441,4587,4587,1441,115,1,1,17,131,611,1937,4433 %N A028277 Odd elements in 4-Pascal triangle A028275 (by row). %K A028277 nonn,tabf %O A028277 0,7 %A A028277 _Mohammad K. Azarian_ %E A028277 More terms from _James Sellers_