A146514 Number of n X n arrays of squares of integers summing to 20 with every element equal to at least one neighbor.
4, 96, 16816, 4506134, 921762154, 339740101635, 36832745153541
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.