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 A083048 #8 Jun 16 2019 08:07:04 %S A083048 1,5,17,36,80,164,300,575,1020,1884,3426,5921,10568,18697,31850,55716, %T A083048 94332,163579,282388,474625,814328,1363979,2328358,3963781,6609951, %U A083048 11209355,18969158,31524783,53186480,88235842,148471479,249459365 %N A083048 Main diagonal of table A083047. %F A083048 a(n) = T(n, n), where T(n, 0) = floor(n*x/(x-1)) + 1, T(n, k+1) = ceiling(x*T(n, k)), for n >= 0, k >= 0, with x = (sqrt(5)+1)/2. %Y A083048 Cf. A083044, A083047, A083050, A083049. %K A083048 nonn %O A083048 0,2 %A A083048 _Paul D. Hanna_, Apr 18 2003