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.

A222452 Number of nX4 0..1 arrays with exactly floor(nX4/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..1 order.

Table of values

n a(n)
1 3
2 7
3 17
4 101
5 426
6 1722
7 8483
8 46788
9 246899
10 1263032
11 6568737
12 34802586
13 184657217
14 976867173
15 5178449568
16 27557967928
17 146974586179
18 784645686795
19 4194027064034
20 22450449919571
21 120330101083792
22 645608703621958

List of values

[3, 7, 17, 101, 426, 1722, 8483, 46788, 246899, 1263032, 6568737, 34802586, 184657217, 976867173, 5178449568, 27557967928, 146974586179, 784645686795, 4194027064034, 22450449919571, 120330101083792, 645608703621958]

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

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