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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.

A321534 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 directions between the rooks is given by A321531(n).

Table of values

n a(n)
1 1
2 1
3 1
4 1
5 2
6 21
7 11
8 74
9 89
10 18

List of values

[1, 1, 1, 1, 2, 21, 11, 74, 89, 18]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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