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 A091452 #2 Mar 30 2012 18:57:05 %S A091452 1,4,2,9,5,3,16,10,6,7,25,17,8,14,13,36,26,11,23,29,19,49,37,12,28,53, %T A091452 21,31,64,50,15,32,74,22,44,41,81,65,18,33,85,45,69,130,43,100,82,20, %U A091452 34,89,52,71,268,67,46 %N A091452 Transpose of array in A091451 associated with period lengths of square roots of positive integers. %C A091452 A permutation of the positive integers. %e A091452 Northwest corner of array: %e A091452 1 2 3 7 %e A091452 4 5 6 14 %e A091452 9 10 8 23 %e A091452 16 17 11 28 %Y A091452 Cf. A091450, A091453. %K A091452 nonn,tabl %O A091452 1,2 %A A091452 _Clark Kimberling_, Feb 03 2004