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A152517
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1/56 of the number of permutations of 7 indistinguishable copies of 1..n with exactly 2 local maxima.
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2
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0, 3, 412, 50080, 6016512, 722051072, 86646800384, 10397622337536, 1247714738176000, 149725769101213696, 17967092296776155136, 2156051075653940805632, 258726129078829378961408, 31047135489462617851822080, 3725656258735540805375623168, 447078751048265125343493357568
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OFFSET
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1,2
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LINKS
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FORMULA
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a(n) = (13*120^(n-1) - 13*8^(n-1) - 14*(n-1)*8^(n-1))/448. - Andrew Howroyd, May 10 2020
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PROG
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(PARI) a(n) = {(13*120^(n-1) - 13*8^(n-1) - 14*(n-1)*8^(n-1))/448} \\ Andrew Howroyd, May 10 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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