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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.

A230190 Number of 7Xn 0..2 arrays x(i,j) with each element horizontally or antidiagonally next to at least one element with value 2-x(i,j).

Table of values

n a(n)
1 0
2 8193
3 1223799
4 756450105
5 400233701367
6 218117038953009
7 117863748242661711
8 63824360296979648967
9 34546668873829672101987
10 18700870126913632045893531
11 10123031708751736005223316745

List of values

[0, 8193, 1223799, 756450105, 400233701367, 218117038953009, 117863748242661711, 63824360296979648967, 34546668873829672101987, 18700870126913632045893531, 10123031708751736005223316745]

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

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