A069422 Number of 8 X n binary arrays with a path of adjacent 1's and no path of adjacent 0's from top row to bottom row.
1, 1391, 806463, 337104939
Offset: 1
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.