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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.

A196137 Number of nX7 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 3
2 46
3 117
4 931
5 3288
6 20706
7 75720
8 384083
9 1662512
10 8212668
11 37172701
12 176457313
13 803299589
14 3768617073
15 17355787464
16 81234030372
17 376860933270
18 1753580102111
19 8135995110263
20 37838340282830
21 175764796211917
22 817275191103917

List of values

[3, 46, 117, 931, 3288, 20706, 75720, 384083, 1662512, 8212668, 37172701, 176457313, 803299589, 3768617073, 17355787464, 81234030372, 376860933270, 1753580102111, 8135995110263, 37838340282830, 175764796211917, 817275191103917]

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

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