cp's OEIS Frontend

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.

A268634 Number of n X 3 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totalling two exactly once.

Table of values

n a(n)
1 12
2 120
3 840
4 5178
5 29772
6 163878
7 875592
8 4578186
9 23548164
10 119570574
11 600870336
12 2993807250
13 14810051580
14 72819229974
15 356173467576
16 1734202809114
17 8410141924596
18 40641730213278
19 195782548631472
20 940481337385122

List of values

[12, 120, 840, 5178, 29772, 163878, 875592, 4578186, 23548164, 119570574, 600870336, 2993807250, 14810051580, 72819229974, 356173467576, 1734202809114, 8410141924596, 40641730213278, 195782548631472, 940481337385122]

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

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