Nothing
stopifnot(all.equal(
exp(stat.extend:::lsubfactorial(1:7)),
c(0, 1, 2, 9, 44, 265, 1854) # verified in wolfram alpha
))
stopifnot(all.equal(
exp(stat.extend:::lsubfactorial(c(0, NA, 2, -1, 3))),
c(1, NA, 1, NA, 2)
))
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