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Inspired by this post and a true story :)
I was going through some old PDF documents on my computer, and I found one that I'd forgotten about. Among the contents was this grid:
Here's a CSV version:
X,1,2,3,4,5,6,7,8,9,10
1,1,2,3,4,5,6,7,8,9,10
2,2,1,2,3,4,5,,6,7,8,9
3,3,2,1,4,2,6,3,8,4,10
4,4,...