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.

A055602 Number of n X n binary matrices with no 0 rows or columns and with n+1 1's.

Table of values

n a(n)
1 0
2 4
3 45
4 432
5 4200
6 43200
7 476280
8 5644800
9 71850240
10 979776000
11 14270256000
12 221298739200
13 3642807168000
14 63465795993600
15 1167099373440000
16 22596613079040000
17 459548157100032000
18 9795631769763840000

List of values

[0, 4, 45, 432, 4200, 43200, 476280, 5644800, 71850240, 979776000, 14270256000, 221298739200, 3642807168000, 63465795993600, 1167099373440000, 22596613079040000, 459548157100032000, 9795631769763840000]

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

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