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Jinyuan Wang, <a href="/A327846/b327846.txt">Table of n, a(n) for n = 1..365</a>
nonn,fini,full
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Array[Range[# - 1, 0, -1] &@ Which[MemberQ[{4, 6, 9, 11}, #], 30, # == 2, 28, True, 31] &, 12] // Flatten (* Michael De Vlieger, Sep 30 2019 *)
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//C++
(C++)
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clarified example wording