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.

A104602 Number of square (0,1)-matrices with exactly n entries equal to 1 and no zero row or columns.

Table of values

n a(n)
0 1
1 1
2 2
3 10
4 70
5 642
6 7246
7 97052
8 1503700
9 26448872
10 520556146
11 11333475922
12 270422904986
13 7016943483450
14 196717253145470
15 5925211960335162
16 190825629733950454
17 6543503207678564364
18 238019066600097607402
19 9153956822981328930170
20 371126108428565106918404

List of values

[1, 1, 2, 10, 70, 642, 7246, 97052, 1503700, 26448872, 520556146, 11333475922, 270422904986, 7016943483450, 196717253145470, 5925211960335162, 190825629733950454, 6543503207678564364, 238019066600097607402, 9153956822981328930170, 371126108428565106918404]

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

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