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.

A139680 Number of n X n symmetric binary matrices with no row sum greater than 4.

Table of values

n a(n)
0 1
1 2
2 8
3 64
4 1024
5 28217
6 1146419
7 62951431
8 4451407563
9 392447922178
10 42102440864054
11 5391561047209898
12 811314950514676762
13 141599096294933832181
14 28348376853054890615951
15 6448749608634353498219753
16 1653216120840296892595307251
17 474197636984335589673286631814

List of values

[1, 2, 8, 64, 1024, 28217, 1146419, 62951431, 4451407563, 392447922178, 42102440864054, 5391561047209898, 811314950514676762, 141599096294933832181, 28348376853054890615951, 6448749608634353498219753, 1653216120840296892595307251, 474197636984335589673286631814]

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

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