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.

A219305 Unchanging value maps: number of nX3 binary arrays indicating the locations of corresponding elements unequal to no horizontal or vertical neighbor in a random 0..2 nX3 array.

Table of values

n a(n)
1 4
2 18
3 90
4 423
5 1958
6 9233
7 43725
8 206269
9 971794
10 4583164
11 21622807
12 101988408
13 481001317
14 2268654909
15 10700463129
16 50469641870
17 238042556300
18 1122743524739
19 5295505220276
20 24976631418525
21 117804014337453
22 555630918690165

List of values

[4, 18, 90, 423, 1958, 9233, 43725, 206269, 971794, 4583164, 21622807, 101988408, 481001317, 2268654909, 10700463129, 50469641870, 238042556300, 1122743524739, 5295505220276, 24976631418525, 117804014337453, 555630918690165]

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

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