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.

A377064 Number of {-1,0,1} n X n matrices with all rows and columns summing to zero up to permutations of rows.

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 117
5 9691
6 5328136
7 18490880339
8 437425741017623
9 72201603445260460729
10 85704032961379965273243136
11 746789021667791689307771100458717
12 48671404211097237572497575028382156068182
13 24090982261278741928086824237920135192809826750606
14 91765357087196227652413496510903409610512369965590600589002

List of values

[1, 1, 2, 6, 117, 9691, 5328136, 18490880339, 437425741017623, 72201603445260460729, 85704032961379965273243136, 746789021667791689307771100458717, 48671404211097237572497575028382156068182, 24090982261278741928086824237920135192809826750606, 91765357087196227652413496510903409610512369965590600589002]

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

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