A069446 Half the number of n X 8 binary arrays with no path of adjacent 1's or adjacent 0's from top row to bottom row.
128, 330752, 276246170, 138031237058
Offset: 2
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.