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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.

A196133 Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,2,1,3,4 for x=0,1,2,3,4.

Table of values

n a(n)
1 1
2 3
3 4
4 19
5 31
6 70
7 117
8 253
9 538
10 1169
11 2401
12 4896
13 10179
14 21291
15 44754
16 93367
17 194747
18 405806
19 848007
20 1772209
21 3704016
22 7737207
23 16162351
24 33766226
25 70554991
26 147429719
27 308053298
28 643669403
29 1344939023
30 2810299720
31 5872263661

List of values

[1, 3, 4, 19, 31, 70, 117, 253, 538, 1169, 2401, 4896, 10179, 21291, 44754, 93367, 194747, 405806, 848007, 1772209, 3704016, 7737207, 16162351, 33766226, 70554991, 147429719, 308053298, 643669403, 1344939023, 2810299720, 5872263661]

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

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