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.

A222765 Number of nX4 0..1 arrays with exactly floor(nX4/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..1 order.

Table of values

n a(n)
1 3
2 11
3 66
4 465
5 3431
6 25772
7 196185
8 1508369
9 11685222
10 91068653
11 713197411
12 5607868082
13 44244333098
14 350085423285
15 2776997948510
16 22076166728109
17 175834747565068
18 1402892278684566
19 11209941707509701
20 89696333927946099

List of values

[3, 11, 66, 465, 3431, 25772, 196185, 1508369, 11685222, 91068653, 713197411, 5607868082, 44244333098, 350085423285, 2776997948510, 22076166728109, 175834747565068, 1402892278684566, 11209941707509701, 89696333927946099]

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

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