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 A053207 #6 Oct 27 2023 22:00:45 %S A053207 0,1,2,3,3,4,5,6,7,6,7,11,13,13,8,9,18,24,26,21,10,11,27,42,50,47,31, %T A053207 12,13,38,69,92,97,78,43,14,15,51,107,161,189,175,121,57,16,17,66,158, %U A053207 268,350,364,296,178,73,18,19,83,224,426,618,714,660,474,251,91,20 %N A053207 Rows of triangle formed using Pascal's rule except begin n-th row with n and end it with n+1. %e A053207 Triangle begins: %e A053207 0; %e A053207 1, 2; %e A053207 3, 3, 4; %e A053207 5, 6, 7, 6; %e A053207 7, 11, 13, 13, 8; %e A053207 ... %Y A053207 Row sums give A053208. %Y A053207 Cf. A007318 (Pascal's triangle) %K A053207 nonn,easy,tabl %O A053207 0,3 %A A053207 _Asher Auel_, Dec 13 1999