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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.

A186164 1/4 the number of nX5 0..3 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

Table of values

n a(n)
1 7
2 2175
3 253341
4 37402872
5 5033988714
6 704281652979
7 96951738076992
8 13435825601048421
9 1856827788245959473
10 256908205340960558187
11 35528479510856892673200
12 4914300705034627821533085

List of values

[7, 2175, 253341, 37402872, 5033988714, 704281652979, 96951738076992, 13435825601048421, 1856827788245959473, 256908205340960558187, 35528479510856892673200, 4914300705034627821533085]

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

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