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.

A213794 Number of n X n 0..2 symmetric arrays with every row summing to n.

Table of values

n a(n)
0 1
1 1
2 3
3 13
4 169
5 5673
6 526443
7 133721189
8 95133854529
9 190409704025737
10 1081810465812816481
11 17533275809917986947451
12 814583187343481957681992873
13 108889213625061640897043875544377
14 42017261328544343771207789776696995237
15 46930798910194830781686389018692804741926963

List of values

[1, 1, 3, 13, 169, 5673, 526443, 133721189, 95133854529, 190409704025737, 1081810465812816481, 17533275809917986947451, 814583187343481957681992873, 108889213625061640897043875544377, 42017261328544343771207789776696995237, 46930798910194830781686389018692804741926963]

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

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