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 A051598 #8 Oct 27 2023 22:00:44 %S A051598 1,2,3,4,5,5,6,9,10,7,8,15,19,17,9,10,23,34,36,26,11,12,33,57,70,62, %T A051598 37,13,14,45,90,127,132,99,50,15,16,59,135,217,259,231,149,65,17,18, %U A051598 75,194,352,476,490,380,214,82,19 %N A051598 Rows of triangle formed using Pascal's rule except begin n-th row with 2*n and end it with 2*n+1. %e A051598 1; 2,3; 4,5,5; 6,9,10,7; 8,15,19,17,9; ... %K A051598 easy,nonn,tabl %O A051598 0,2 %A A051598 _Asher Auel_ %E A051598 Title and offset corrected by _Sean A. Irvine_, Sep 20 2021