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 A097292 #12 May 09 2022 08:37:16 %S A097292 1,2,4,5,3,9,10,8,7,16,17,13,6,12,25,26,20,15,14,19,36,37,29,22,11,21, %T A097292 28,49,50,40,31,24,23,30,39,64,65,53,42,33,18,32,41,52,81,82,68,55,44, %U A097292 35,34,43,54,67,100,101,85,70,57,46,27,45,56,69,84,121 %N A097292 Rectangular array T, by antidiagonals: T(n,k) = rank of n in A097291 at which the pair (n,k) occurs. %C A097292 Row 1 is A002522. %C A097292 Column 1 (squares) is A002900. %C A097292 Main diagonal is 2+(n-1)^2 for n>1, cf. A010000. %e A097292 Northwest corner: %e A097292 1 2 5 10 %e A097292 4 3 8 13 %e A097292 9 7 6 15 %e A097292 16 12 14 11 %e A097292 T(3,4) = 15 because in A097291, the pair 3,4 occurs at positions 15,16. %Y A097292 Cf. A097291. %Y A097292 Cf. A002522, A010000. %K A097292 nonn,tabl %O A097292 1,2 %A A097292 _Clark Kimberling_, Aug 05 2004