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.

A221289 Equals two maps: number of nX6 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..3 nX6 array.

Table of values

n a(n)
1 12
2 792
3 48298
4 2890017
5 172905144
6 10344276279
7 618825190371
8 37018574118868
9 2214457259485909
10 132469006243923162
11 7924304243009714341
12 474032340904538992523
13 28356641623302251544461

List of values

[12, 792, 48298, 2890017, 172905144, 10344276279, 618825190371, 37018574118868, 2214457259485909, 132469006243923162, 7924304243009714341, 474032340904538992523, 28356641623302251544461]

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

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