[VA] My 2024's very first little teaser

[PeterP]

J-F, that was the idea I went down but I had not thought about making it a bigger matrix. If you flip the sign of the elements b and f ( to -b and -f) then det(A’) is perm(A) - ceg.

I like your idea of a 5x5 or 6x6!

My other thought which I was unable to get to anywhere with, was around recursion and if that is something that someone cleverer than me could use here