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f a=[sum[1|x<a=[sum[1|j<-a,i<x]|i<i<=j]|i<-[0[1..a!!0-1]]0]]
Attempt This Online!Attempt This Online!
-1 byte thanks to matteo_c
Basically a port of Command Master's python answer
f a=[sum[1|x<-a,i<x]|i<-[0..a!!0-1]]
Attempt This Online!
f a=[sum[1|j<-a,i<=j]|i<-[1..a!!0]]
