A069391 Number of n X 16 binary arrays with a path of adjacent 1's from top row to bottom row.
65535, 4251920575, 264152863210065, 15574913193760097649, 884176137127765554601535
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.