A087928 Number of ways of arranging the numbers 1 ... 7n into a 7 X n array so there is exactly one local maximum.
64, 57477120, 1323082429842432, 137813651152462288749440, 49992325433734834899948931370880
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.