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 A274529 #22 Nov 30 2016 01:03:25 %S A274529 1,3,4,6,6,8,10,11,13,14,16,18,18,20,20,22,22,24,26,26,27,29,30,32,35, %T A274529 35,38,40,40,41,43,43,43,43,47,47,47,52,53,53,54,56,58,58,60,60,60,62, %U A274529 64,64,67,67,68,73,74,74,74,74,77,78,78,79,80,87,87,87,87 %N A274529 Total number of distinct numbers in the first n antidiagonals of infinite Sudoku-type array A269526. %C A274529 a(n) is also the total number of distinct numbers in the first n antidiagonals of the square array A274528. %H A274529 Alois P. Heinz, <a href="/A274529/b274529.txt">Table of n, a(n) for n = 1..1000</a> %e A274529 For n = 3, the first three antidiagonals of the square array A269526 are [1], [3, 2], [2, 4, 3]. The first four positive integers are in the list, so a(3) = 4. %Y A274529 Cf. A269526, A274528, A274530. %Y A274529 Row lengths of A274534. %Y A274529 A275883 is closely related but a different sequence. %K A274529 nonn %O A274529 1,2 %A A274529 _Omar E. Pol_, Jun 30 2016 %E A274529 More terms from _Alois P. Heinz_, Jun 30 2016