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 A276324 #6 Aug 30 2016 14:46:30 %S A276324 1,4,5,7,8,14,15,17,18,19,20,23,24,30,31,34,35,40,41,43,44,45,46,49, %T A276324 50,54,56,59,60,62,63,65,68,69,72,77,78,81,82,85,86,89,90,93,94,95,96, %U A276324 101,103,106,108,111,113,114,116,119,120,122,123,125,127,128 %N A276324 Antidiagonal indices of Greedy Queens (see A065188). %C A276324 a(n) is the index of the antidiagonal of the n-th queen. %H A276324 Alois P. Heinz, <a href="/A276324/b276324.txt">Table of n, a(n) for n = 1..10000</a> %e A276324 The first queen is in the first antidiagonal, the second queen is in the fourth antidiagonal, ... . The antidiagonals with indices 2, 3, 6, 9, ... do not contain a queen: %e A276324 : %e A276324 : Q//// ... %e A276324 : ///Q/ ... %e A276324 : /Q/// ... %e A276324 : ////Q ... %e A276324 : //Q// ... %e A276324 : ///// ... %e A276324 : ..... %Y A276324 Cf. A065188, A276325. %K A276324 nonn %O A276324 1,2 %A A276324 _Alois P. Heinz_, Aug 30 2016