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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.

A196142 Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,0,4,1,2 for x=0,1,2,3,4.

Table of values

n a(n)
1 5
2 17
3 26
4 83
5 168
6 346
7 865
8 2055
9 4745
10 10866
11 24967
12 57786
13 134514
14 312597
15 722915
16 1670991
17 3869674
18 8969607
19 20789120
20 48159310
21 111529135
22 258315343
23 598428365
24 1386426078
25 3211799633
26 7440009880
27 17234511484
28 39924363651
29 92487922123

List of values

[5, 17, 26, 83, 168, 346, 865, 2055, 4745, 10866, 24967, 57786, 134514, 312597, 722915, 1670991, 3869674, 8969607, 20789120, 48159310, 111529135, 258315343, 598428365, 1386426078, 3211799633, 7440009880, 17234511484, 39924363651, 92487922123]

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

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