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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.

A183554 T(n,k)=Number of nXk 0..2 arrays with each element equal to either the maximum or the minimum of its horizontal and vertical neighbors.

Table of values

n a(n)
1 0
2 3
3 3
4 3
5 15
6 3
7 9
8 71
9 71
10 9
11 15
12 299
13 583
14 299
15 15
16 33
17 1325
18 5287
19 5287
20 1325
21 33
22 63
23 5845
24 46841
25 95101
26 46841
27 5845
28 63
29 129
30 25785
31 417809
32 1728533
33 1728533
34 417809
35 25785
36 129
37 255
38 113841
39 3721925
40 31363527
41 63868351
42 31363527
43 3721925
44 113841

List of values

[0, 3, 3, 3, 15, 3, 9, 71, 71, 9, 15, 299, 583, 299, 15, 33, 1325, 5287, 5287, 1325, 33, 63, 5845, 46841, 95101, 46841, 5845, 63, 129, 25785, 417809, 1728533, 1728533, 417809, 25785, 129, 255, 113841, 3721925, 31363527, 63868351, 31363527, 3721925, 113841]

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

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