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 A097347 #3 Mar 30 2012 18:57:05 %S A097347 1,2,3,5,4,6,10,8,7,11,17,13,9,12,18,26,20,15,14,19,27,37,29,22,16,21, %T A097347 28,38,50,40,31,24,23,30,39,51,65,53,42,33,25,32,41,52,66,82,68,55,44, %U A097347 35,34,43,54,67,83,101,85,70,57,46,36,45,56,69,84,102,122,104,87,72,59 %N A097347 Rectangular array, by antidiagonals: T(n,k) = rank of k-th n in A097291. %C A097347 As a sequence, this is a permutation of the natural numbers. Row 1 is A002522 (n^2 + 1); main diagonal is A000290 (n^2); column 1 is A010000 (n^2 + 2). %e A097347 Northwest corner: %e A097347 1 2 5 10 %e A097347 3 4 8 13 %e A097347 6 7 9 15 %e A097347 11 12 14 16 %Y A097347 Cf. A097291, A097292. %K A097347 nonn,tabl %O A097347 1,2 %A A097347 _Clark Kimberling_, Aug 06 2004