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 A320576 #9 Oct 22 2018 01:38:37 %S A320576 1,1,2,1,1,10,1,1,1,1,1,1,1,1 %N A320576 a(n) gives the number of configurations of non-attacking rooks up to symmetry on an n X n chessboard such that the number of distinct distances between the rooks is given by A319476(n). %H A320576 Giovanni Resta, <a href="/A320576/a320576.pdf">Illustration of a(3)-a(14)</a> %e A320576 For n = 7 the a(7) = 1 board with A319476(7) = 5 distinct distances is %e A320576 +---+---+---+---+---+---+---+ %e A320576 7 | | | * | | | | | %e A320576 +---+---+---+---+---+---+---+ %e A320576 6 | | | | | | * | | %e A320576 +---+---+---+---+---+---+---+ %e A320576 5 | * | | | | | | | %e A320576 +---+---+---+---+---+---+---+ %e A320576 4 | | | | * | | | | %e A320576 +---+---+---+---+---+---+---+. %e A320576 3 | | | | | | | * | %e A320576 +---+---+---+---+---+---+---+ %e A320576 2 | | * | | | | | | %e A320576 +---+---+---+---+---+---+---+ %e A320576 1 | | | | | * | | | %e A320576 +---+---+---+---+---+---+---+ %e A320576 A B C D E F G %Y A320576 Cf. A319476, A320575, A320576, A320448, A320573, A320574. %K A320576 nonn,more %O A320576 1,3 %A A320576 _Peter Kagey_, Oct 15 2018 %E A320576 a(10)-a(14) from _Giovanni Resta_, Oct 21 2018