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Or R>=4.1, 3626 bytes by replacing the word function with \.
function
\
function(p,n=sum(p|1),k=1:n)(k*rev(n+1n<-kseq(p))*n)%*%p
Try it online!Try it online!
Or R>=4.1, 36 bytes by replacing the word function with \.
function(p,n=sum(p|1),k=1:n)(k*(n+1-k))%*%p
Try it online!
Or R>=4.1, 26 bytes by replacing the word function with \.
function(p)(rev(n<-seq(p))*n)%*%p
