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.

A222873 Number of nX3 0..3 arrays with no more than floor(nX3/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

Table of values

n a(n)
1 2
2 122
3 6282
4 443510
5 23794078
6 1698174722
7 93656293632
8 6637413406814
9 372075279639542
10 26219034320665058
11 1485998820062892388
12 104217650825897197592
13 5955892893018468638926
14 416011416350266218862952

List of values

[2, 122, 6282, 443510, 23794078, 1698174722, 93656293632, 6637413406814, 372075279639542, 26219034320665058, 1485998820062892388, 104217650825897197592, 5955892893018468638926, 416011416350266218862952]

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

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