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.

A255936 Number of n X n binary matrices having a contiguous 2 by 2 submatrix whose every element is 1.

Table of values

n a(n)
0 0
1 0
2 1
3 95
4 23360
5 17853159
6 47300505935
7 455725535985152
8 16477833186525760257
9 2285218507961233452756479
10 1234874616385516438189472371200
11 2628743329824106687023439956782224783
12 22201933512060923158839975337648286975677119

List of values

[0, 0, 1, 95, 23360, 17853159, 47300505935, 455725535985152, 16477833186525760257, 2285218507961233452756479, 1234874616385516438189472371200, 2628743329824106687023439956782224783, 22201933512060923158839975337648286975677119]

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

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