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.

A222374 Number of nX3 0..3 arrays with no more than floor(nX3/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.

Table of values

n a(n)
1 1
2 5
3 9
4 118
5 498
6 8111
7 37107
8 676485
9 3140167
10 58995438
11 275054103
12 5223616489
13 24395423052
14 466212749842
15 2180168118272
16 41855166855421
17 195981171753608
18 3775984650279490
19 17703134058396750
20 342076192235557748

List of values

[1, 5, 9, 118, 498, 8111, 37107, 676485, 3140167, 58995438, 275054103, 5223616489, 24395423052, 466212749842, 2180168118272, 41855166855421, 195981171753608, 3775984650279490, 17703134058396750, 342076192235557748]

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

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