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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.

A229930 Number of nX4 0..2 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value 2-x(i,j).

Table of values

n a(n)
1 9
2 739
3 33119
4 1622763
5 78416265
6 3788842363
7 183213209145
8 8859387292449
9 428371366651425
10 20712776154273627
11 1001517772189056421
12 48426025953836117091
13 2341525140459285538795
14 113218875141418681649923

List of values

[9, 739, 33119, 1622763, 78416265, 3788842363, 183213209145, 8859387292449, 428371366651425, 20712776154273627, 1001517772189056421, 48426025953836117091, 2341525140459285538795, 113218875141418681649923]

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

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