cp's OEIS Frontend

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.

A359032 a(n) is the number of ways to place non-attacking queens on an n X n board with no queens above the main diagonal.

Table of values

n a(n)
0 1
1 2
2 4
3 9
4 23
5 66
6 204
7 669
8 2305
9 8348
10 31542
11 124021
12 507937
13 2154494
14 9455972
15 42847307
16 200258387
17 962904904
18 4759773172
19 24142168317
20 125575232141
21 668689805690
22 3643481771390
23 20286338601133

List of values

[1, 2, 4, 9, 23, 66, 204, 669, 2305, 8348, 31542, 124021, 507937, 2154494, 9455972, 42847307, 200258387, 962904904, 4759773172, 24142168317, 125575232141, 668689805690, 3643481771390, 20286338601133]

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

Content is available under The OEIS End-User License Agreement.