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.

A222505 Number of nX4 0..1 arrays with exactly floor(nX4/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..1 order.

Table of values

n a(n)
1 3
2 3
3 15
4 84
5 497
6 2862
7 15420
8 86570
9 484976
10 2751326
11 15597305
12 89022483
13 508390703
14 2915183250
15 16739260404
16 96360825455
17 555513635334
18 3208071753051
19 18550893260858
20 107413402302763
21 622649366897782
22 3613180083184007

List of values

[3, 3, 15, 84, 497, 2862, 15420, 86570, 484976, 2751326, 15597305, 89022483, 508390703, 2915183250, 16739260404, 96360825455, 555513635334, 3208071753051, 18550893260858, 107413402302763, 622649366897782, 3613180083184007]

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

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