A069390 Number of n X 15 binary arrays with a path of adjacent 1's from top row to bottom row.
32767, 1059392917, 32599584662597, 950437243856526737, 26706726258154287563903
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.