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 A163899 #3 Mar 31 2012 13:21:18 %S A163899 0,0,1,9,1,8,9,2,5,18,0,2,4,5,25,1,2,5,2,20,29,0,1,5,9,17,10,36,0,1,4, %T A163899 9,16,25,36,49,225,1,4,2,16,10,5,25,128,225,170,4,1,17,10,5,18,113, %U A163899 162,196,170,125,9,16,25,5,10,128,113,149,225,170,125,90,16,9,4,1,128 %N A163899 Array A(i,j) giving the square of distance from (i,j) to the location where A163357(i,j) is situated in array A054238(i,j), listed antidiagonally as A(0,0), A(0,1), A(1,0), A(0,2), A(1,1), A(2,0), ... %H A163899 A. Karttunen, <a href="/A163899/b163899.txt">Table of n, a(n) for n = 0..32895</a> %e A163899 The top left 8x8 corner of this array: %e A163899 +0 +0 +9 +9 +0 +1 +0 +0 %e A163899 +1 +1 +2 +2 +2 +1 +1 +1 %e A163899 +8 +5 +4 +5 +5 +4 +4 +4 %e A163899 18 +5 +2 +9 +9 +2 +1 +9 %e A163899 25 20 17 16 16 17 16 16 %e A163899 29 10 25 10 10 25 +9 25 %e A163899 36 36 +5 +5 +5 +4 36 36 %e A163899 49 25 18 10 +1 10 25 49 %Y A163899 a(n) = A163900(A163357(n)). Positions of zeros: A165403. See also A163898, A163904. %K A163899 nonn,tabl %O A163899 0,4 %A A163899 _Antti Karttunen_, Sep 19 2009