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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.

A213796 Number of n X n 0..4 symmetric arrays with every row summing to 2*n.

Table of values

n a(n)
0 1
1 1
2 5
3 57
4 3249
5 815263
6 932587453
7 4893373431575
8 119570350092328225
9 13715276642286471266345
10 7439775168632414842497242951
11 19190656372074846793620422063221831
12 236483103820478991417179706813598595965425

List of values

[1, 1, 5, 57, 3249, 815263, 932587453, 4893373431575, 119570350092328225, 13715276642286471266345, 7439775168632414842497242951, 19190656372074846793620422063221831, 236483103820478991417179706813598595965425]

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

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