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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.

A185899 1/8 the number of n X 2 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 15
3 196
4 2765
5 38731
6 545328
7 7675381
8 108065699
9 1521488668
10 21421955457
11 301612441375
12 4246586949080
13 59790307544569
14 841824567122343
15 11852566615920436
16 166879587240301061
17 2349600516714827299

List of values

[1, 15, 196, 2765, 38731, 545328, 7675381, 108065699, 1521488668, 21421955457, 301612441375, 4246586949080, 59790307544569, 841824567122343, 11852566615920436, 166879587240301061, 2349600516714827299]

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

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