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.

A260582 Number of ways to place 2n rooks on n X n board, 2 rooks in each row and each column, multiple rooks in a cell allowed, and exactly 4 rooks below the main diagonal.

Table of values

n a(n)
3 1
4 72
5 2438
6 48965
7 727982
8 9002669
9 98831244
10 1001534339
11 9604385112
12 88600727292
13 795108048465
14 6995452987296
15 60672964077315
16 520801298224219
17 4436874672072459
18 37592602817393616
19 317246106027904761
20 2669508900483670024
21 22415690107381454687

List of values

[1, 72, 2438, 48965, 727982, 9002669, 98831244, 1001534339, 9604385112, 88600727292, 795108048465, 6995452987296, 60672964077315, 520801298224219, 4436874672072459, 37592602817393616, 317246106027904761, 2669508900483670024, 22415690107381454687]

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

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