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.

A067209 Number of n X n 0..1 matrices with all row and column sums equal.

Table of values

n a(n)
0 1
1 2
2 4
3 14
4 140
5 4322
6 434542
7 144109562
8 165431317452
9 654143160457922
10 9331115832294448754
11 469229841129645179004962
12 87481268294773501231007850158
13 58328998963405322376273800187396962
14 147013017541698957281403494604070439260442

List of values

[1, 2, 4, 14, 140, 4322, 434542, 144109562, 165431317452, 654143160457922, 9331115832294448754, 469229841129645179004962, 87481268294773501231007850158, 58328998963405322376273800187396962, 147013017541698957281403494604070439260442]

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

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