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 A047883 #10 Dec 07 2020 02:15:51
%S A047883 0,2,9,20,27,32,39,46,53,60,67,74,81,88,95,102,109,116,123,130,137,
%T A047883 144,151,158,165,172,179,186,193,200,207,214,221,228,235
%N A047883 Squares on unbounded chessboard for which the least number of knight's moves from corner (0,0) is n.
%F A047883 a(n)=7+a(n-1) for n >= 6.
%t A047883 Join[{0,2,9,20,27},NestList[#+7&,32,30]] (* _Harvey P. Dale_, Sep 07 2013 *)
%Y A047883 Cf. A098500 (partial sums).
%K A047883 nonn
%O A047883 0,2
%A A047883 _Clark Kimberling_