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 A183049 #6 Mar 30 2012 18:57:12 %S A183049 0,3,2,2,3,1,1,2,2,4,2,3,3,3,3,3,4,4,2,2,2,4,5,3,3,3,3,3,3,4,4,4,4,4, %T A183049 4,4,4,5,5,5,3,3,3,3,5,5,6,6,4,4,4,4,4,4,4,6,7,5,5,5,5,5,5,5,5,5,5,6, %U A183049 6,6,6,4,4,4,4,4,6,6,6,7,7,7,5,5,5,5,5 %N A183049 Array of least knight's moves to points (n,0), (n-1,1), ..., (1,n-1) on infinite chessboard. %C A183049 The n points (n,0), (n-1,1), ..., (1,n-1) lie in a diagonal in the first quadrant. Adjoining the matching points in the other quadrants yields the square |i|+|j|=n, as in A183051. For a description of the infinite chessboard, see A065775. %F A183049 See A065775. %e A183049 First 6 rows (after the initial 0): %e A183049 3 %e A183049 2 2 %e A183049 3 1 1 %e A183049 2 2 4 2 %e A183049 3 3 3 3 3 %e A183049 4 4 2 2 2 4 %e A183049 These numbers occupy positions on the chessboard as %e A183049 indicated here, starting at the left bottom corner: %e A183049 ..4 %e A183049 ..3 4 %e A183049 ..2 3 2 %e A183049 ..1 4 3 2 %e A183049 ..2 1 2 3 4 %e A183049 0 3 2 3 2 3 4 ... (This row is A018837.) %Y A183049 Cf. A065775, A183050, A183051. %K A183049 nonn,tabf %O A183049 1,2 %A A183049 _Clark Kimberling_, Dec 22 2010