Nothing
nStirling2 <-
function (n, k) {
if (n<0) stop("n < 0")
if (k<0) stop("k < 0")
if (k>n) stop("k > n")
m<-0;
for (j in 0:k) m<-m+(-1)^(k-j)*choose(k,j)*j^n;
return(m/factorial(k));
}
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