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 A183053 #10 Jun 23 2021 11:20:11 %S A183053 0,12,28,48,88,148,220,312,440,588,772,1000,1248,1548,1908,2288,2728, %T A183053 3244,3788,4400,5096,5828,6644,7552,8496,9540,10692,11880,13176,14596, %U A183053 16060,17640,19352,21116,23012,25048 %N A183053 Sums of knight's moves over the square |i|+|j|<=n on infinite chessboard. %C A183053 Partial sums matching the squares |i|+|j|=n are given by A183052. %F A183053 See A065775. %F A183053 Empirical g.f.: -4*x*(2*x^12-2*x^11+2*x^10-4*x^9+2*x^8-x^7-x^6-4*x^4-4*x^2-x-3) / ((x-1)^4*(x^2+1)*(x^2+x+1)^2). - _Colin Barker_, May 04 2014 %Y A183053 Cf. A065775, A183051, A183052. %K A183053 nonn %O A183053 0,2 %A A183053 _Clark Kimberling_, Dec 22 2010