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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.

A196851 Number of n X 3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,1,0,2,4 for x=0,1,2,3,4.

Table of values

n a(n)
1 4
2 38
3 206
4 1370
5 8767
6 56470
7 363685
8 2343584
9 15108610
10 97376923
11 627590184
12 4044924351
13 26070308556
14 168028055199
15 1082971243944
16 6979940126878
17 44986968132898
18 289949111595991
19 1868774104215258
20 12044584704922151

List of values

[4, 38, 206, 1370, 8767, 56470, 363685, 2343584, 15108610, 97376923, 627590184, 4044924351, 26070308556, 168028055199, 1082971243944, 6979940126878, 44986968132898, 289949111595991, 1868774104215258, 12044584704922151]

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

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