A069411 Half the number of n X 11 binary arrays with a path of adjacent 1's and a path of adjacent 0's from top row to bottom row.
1023, 1921029, 3060942133, 4277806868563
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.