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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.

A197446 Number of nX4 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 4
2 36
3 474
4 4837
5 52117
6 585194
7 6455759
8 71202438
9 787298158
10 8700460833
11 96129107870
12 1062244177133
13 11737953179188
14 129703872646573
15 1433228960340464
16 15837211757913841
17 175001375414696401

List of values

[4, 36, 474, 4837, 52117, 585194, 6455759, 71202438, 787298158, 8700460833, 96129107870, 1062244177133, 11737953179188, 129703872646573, 1433228960340464, 15837211757913841, 175001375414696401]

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

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