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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.

A197444 Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,1,1,0,0 for x=0,1,2,3,4.

Table of values

n a(n)
1 2
2 5
3 12
4 36
5 107
6 321
7 957
8 2868
9 8581
10 25694
11 76914
12 230273
13 689377
14 2063867
15 6178778
16 18498023
17 55379290
18 165794354
19 496354537
20 1485984549
21 4448735449
22 13318609060
23 39873206463
24 119372269782
25 357376295102
26 1069911935955

List of values

[2, 5, 12, 36, 107, 321, 957, 2868, 8581, 25694, 76914, 230273, 689377, 2063867, 6178778, 18498023, 55379290, 165794354, 496354537, 1485984549, 4448735449, 13318609060, 39873206463, 119372269782, 357376295102, 1069911935955]

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

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