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 A321532 #7 Dec 14 2018 19:49:51 %S A321532 1,2,4,8,16,168,88,592,712 %N A321532 a(n) gives the number of configurations of non-attacking rooks on an n X n chessboard such that the number of distinct directions between the rooks is given by A321531(n). %e A321532 For n = 5, the a(5) = 16 configurations of nonattacking rooks with the maximal number of directions between them are given by the following two chessboards under all eight symmetries of the square. %e A321532 +---+---+---+---+---+ %e A321532 5| X | | | | | %e A321532 +---+---+---+---+---+ %e A321532 4| | | X | | | %e A321532 +---+---+---+---+---+ %e A321532 3| | | | X | | %e A321532 +---+---+---+---+---+ %e A321532 2| | | | | X | %e A321532 +---+---+---+---+---+ %e A321532 1| | X | | | | %e A321532 +---+---+---+---+---+ %e A321532 A B C D E %e A321532 +---+---+---+---+---+ %e A321532 5| X | | | | | %e A321532 +---+---+---+---+---+ %e A321532 4| | | | X | | %e A321532 +---+---+---+---+---+ %e A321532 3| | | X | | | %e A321532 +---+---+---+---+---+ %e A321532 2| | | | | X | %e A321532 +---+---+---+---+---+ %e A321532 1| | X | | | | %e A321532 +---+---+---+---+---+ %e A321532 A B C D E %Y A321532 Cf. A321531. %K A321532 nonn,more %O A321532 1,2 %A A321532 _Peter Kagey_, Nov 12 2018