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 A341199 #13 Feb 09 2021 02:45:18 %S A341199 4,16,16,24,36,32,48,44,56,72,64,76,80,88,92,96,112,116,120,120,128, %T A341199 140,152,144,148,184,160,184,172,184,208,188,208,208,220,240,224,240, %U A341199 244,256,256,252,288,272,280,276,296,312,308,320,312,328,340,328,344 %N A341199 First differences of A341198. %F A341199 a(n) = A341198(n) - A341198(n-1). %F A341199 a(n) == 0 (mod 4). %F A341199 If A341198(n) = Pi*n^2 + c*n + o(n) for some constant c (as suggested in a comment to A341198), it holds that a(n) ~ 2*Pi*n + o(n). %Y A341199 Cf. A341198. %K A341199 nonn %O A341199 1,1 %A A341199 _Pontus von Brömssen_, Feb 06 2021