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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.

A185900 1/8 the number of nX3 0..7 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

Table of values

n a(n)
1 1
2 196
3 7854
4 546280
5 28967421
6 1748982326
7 98953708266
8 5781843976125
9 332434487651623
10 19267808077145684
11 1112287426359828719
12 64338491237732078416
13 3717840477156798616939
14 214944959102538319886245

List of values

[1, 196, 7854, 546280, 28967421, 1748982326, 98953708266, 5781843976125, 332434487651623, 19267808077145684, 1112287426359828719, 64338491237732078416, 3717840477156798616939, 214944959102538319886245]

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

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