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 A194496 #8 Oct 27 2019 22:33:17 %S A194496 0,0,0,0,0,0,0,0,64,1644,19306,146718,820218,3670288,13846830, %T A194496 45661556,134896662,364019248,909633276,2129318414,4709083054, %U A194496 9912162234,19970298696,38707229282,72458290216,131476840106,231906957348 %N A194496 Number of ways to arrange 6 nonattacking queens on the lower triangle of an n X n board. %C A194496 Column 6 of A194498. %H A194496 R. H. Hardin, <a href="/A194496/b194496.txt">Table of n, a(n) for n = 1..35</a> %e A194496 Some solutions for 9 X 9: %e A194496 0 0 0 0 %e A194496 0 1 0 0 1 0 0 0 %e A194496 0 0 0 1 0 0 0 0 0 0 1 0 %e A194496 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 %e A194496 0 0 0 0 0 0 0 0 0 1 0 0 0 0 1 1 0 0 0 0 %e A194496 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 %e A194496 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 %e A194496 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 %e A194496 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 %K A194496 nonn %O A194496 1,9 %A A194496 _R. H. Hardin_, Aug 26 2011