We call a function f: A B almost injective if for every b e B the number of elements a with f(a) = b is at most two. Let M (n) be the number of almost injective monotone functions from [n] to n). What is M(5)?

Computer Networking: A Top-Down Approach (7th Edition)
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Author:James Kurose, Keith Ross
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We call a function f : A B almost injective if for every b € B the number of elements a with f (a) = b is at
most two. Let M(n) be the number of almost injective monotone functions from [n] to (n]. What is M(5)?
%3D
Transcribed Image Text:We call a function f : A B almost injective if for every b € B the number of elements a with f (a) = b is at most two. Let M(n) be the number of almost injective monotone functions from [n] to (n]. What is M(5)? %3D
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