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 A003984 #19 Feb 22 2022 00:07:51 %S A003984 0,1,1,2,1,2,3,2,2,3,4,3,2,3,4,5,4,3,3,4,5,6,5,4,3,4,5,6,7,6,5,4,4,5, %T A003984 6,7,8,7,6,5,4,5,6,7,8,9,8,7,6,5,5,6,7,8,9,10,9,8,7,6,5,6,7,8,9,10,11, %U A003984 10,9,8,7,6,6,7,8,9,10,11,12,11,10,9,8,7,6,7,8,9,10,11,12,13,12,11,10,9,8,7,7,8 %N A003984 Table of max(x,y), where (x,y) = (0,0),(0,1),(1,0),(0,2),(1,1),(2,0),... %F A003984 From _Franklin T. Adams-Watters_, Feb 06 2006: (Start) %F A003984 G.f.: (x+y-3xy+x^2 y^2)/((1-x)^2 (1-y)^2 (1-xy)). %F A003984 T(n,m) = n + m - min(n,m); a(n) = A003056(n) - A004197(n). (End) %F A003984 a(n) = (1/2)*(t - 1 + abs(t^2 - 2*n - 1)), where t = floor(sqrt(2*n+1)+1/2). - _Ridouane Oudra_, May 03 2019 %e A003984 Top left corner of array: %e A003984 0 1 2 3 %e A003984 1 1 2 3 %e A003984 2 2 2 3 %e A003984 3 3 3 3 %Y A003984 Cf. A051125, A003056, A004197. %Y A003984 Antidiagonal sums are in A001859. %K A003984 tabl,nonn %O A003984 0,4 %A A003984 _Marc LeBrun_