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.

A002820 Number of n X n invertible binary matrices A such that A+I is invertible.

Table of values

n a(n)
0 1
1 0
2 2
3 48
4 5824
5 2887680
6 5821595648
7 47317927329792
8 1544457148312846336
9 202039706313624586813440
10 105823549214125066767168438272
11 221819704567105547916502447159246848
12 1860304261534304703934696550224148083769344
13 62413833036707798343389591015829588620560344023040

List of values

[1, 0, 2, 48, 5824, 2887680, 5821595648, 47317927329792, 1544457148312846336, 202039706313624586813440, 105823549214125066767168438272, 221819704567105547916502447159246848, 1860304261534304703934696550224148083769344, 62413833036707798343389591015829588620560344023040]

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

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