In the main documentation page for std.algorithm, nthPermutation is missing. It should be in the list of functions under the Sorting submodule.
@DanutAldea created dlang/phobos pull request #8672 "Fix Issue 20397" fixing this issue: - Fix Issue 20397 https://github.com/dlang/phobos/pull/8672
dlang/phobos pull request #8672 "Fix Issue 20397" was merged into master: - 794b4d3c80ebea50b12c49334adacc79833e7be3 by DanutAldea: Fix Issue 20397 https://github.com/dlang/phobos/pull/8672