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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.

A197667 Number of n X 3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,0,1,0,1 for x=0,1,2,3,4.

Table of values

n a(n)
1 4
2 22
3 95
4 546
5 2765
6 14503
7 74812
8 386556
9 2008698
10 10415923
11 54096117
12 280793815
13 1457402796
14 7564115674
15 39256668738
16 203743660496
17 1057439556784
18 5488205547156
19 28484308704921
20 147836021658293
21 767281388051654

List of values

[4, 22, 95, 546, 2765, 14503, 74812, 386556, 2008698, 10415923, 54096117, 280793815, 1457402796, 7564115674, 39256668738, 203743660496, 1057439556784, 5488205547156, 28484308704921, 147836021658293, 767281388051654]

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

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