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A152506
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1/5 of the number of permutations of 4 indistinguishable copies of 1..n with exactly 4 local maxima.
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1
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0, 1, 3277, 2483739, 1156102209, 443469188267, 156475306087585, 53194863262703203, 17785402102372820321, 5902647043581987876939, 1952635794694419540863057, 645038537405519790637628675, 212955626342843141187623423793, 70288152907297654332280282998411
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OFFSET
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1,3
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LINKS
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PROG
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(PARI) \\ PeaksBySig defined in A334774.
a(n) = {PeaksBySig(vector(n, i, 4), [3])[1]/5} \\ Andrew Howroyd, May 12 2020
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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