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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.

A198182 Number of nX5 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,2,1,0,0 for x=0,1,2,3,4.

Table of values

n a(n)
1 1
2 16
3 77
4 331
5 2033
6 8298
7 48958
8 216307
9 1155412
10 5522239
11 28200527
12 139401115
13 695721892
14 3477106364
15 17307490471
16 86498278609
17 430707067503
18 2150928384789
19 10722364479972
20 53497634923663
21 266813770707004
22 1330929200315097

List of values

[1, 16, 77, 331, 2033, 8298, 48958, 216307, 1155412, 5522239, 28200527, 139401115, 695721892, 3477106364, 17307490471, 86498278609, 430707067503, 2150928384789, 10722364479972, 53497634923663, 266813770707004, 1330929200315097]

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

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