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 A028281 #8 Jul 02 2025 16:01:55 %S A028281 1,5,7,23,9,31,55,11,61,13,73,237,735,15,1045,1947,115,1441,4587,17, %T A028281 131,611,1937,4433,7579,9867,19,185,21,205,1241,6477,7923,28101,271, %U A028281 9595,105621,25,295,2191,11515,45619,141645,353685,1076559,27,1571889 %N A028281 Distinct odd elements in 4-Pascal triangle A028275 (by row). %K A028281 nonn,tabf %O A028281 0,2 %A A028281 _Mohammad K. Azarian_ %E A028281 More terms from _James Sellers_