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 A275898 #19 Nov 30 2016 01:20:04 %S A275898 1,8,14,24,33,97,115,143,164,184,198,262,291,447,485,582,609,796,846, %T A275898 920,973,1019,1053,1195,1256,1465,1562,1734,1808,1915,1993,2105,2321, %U A275898 2388,2584,2956,3052,3290,3353,3603,3709,3972,4040,4314,4430,4523,4597,5089,5317,5606,5845,6174,6372 %N A275898 Read the infinite chessboard underlying A065188 by successive antidiagonals and record when the queens are encountered. Here the rows and columns are indexed starting at 1 (as in A065188). %H A275898 Alois P. Heinz, <a href="/A275898/b275898.txt">Table of n, a(n) for n = 1..10000</a> %e A275898 The second queen appears in the fourth antidiagonal at position 8 (calling the top left square square 1): %e A275898 Qxxx %e A275898 xxxQ %e A275898 xQxx %e A275898 xxxx %e A275898 so a(2) = 8. %Y A275898 Cf. A065188, A275895, A275897. %K A275898 nonn %O A275898 1,2 %A A275898 _N. J. A. Sloane_, Aug 23 2016, following a suggestion from _David A. Corneth_