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 A334777 Total number of local maxima in all permutations of 2 indistinguishable copies of 1..n. 3
 1, 9, 195, 7140, 396900, 31185000, 3291888600, 449513064000, 77111922888000, 16235185926960000, 4116213602701200000, 1237059394731800640000, 434864246413372776000000, 176784623645708110032000000, 82297894534015170170160000000, 43496460979945066988294400000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Andrew Howroyd, Table of n, a(n) for n = 1..100 FORMULA a(n) = Sum_{k=1..n} k*A334774(n,k). a(n) = A334776(n) + A000680(n). PROG (PARI) \\ PeaksBySig defined in A334774. a(n)={my(u=PeaksBySig(vector(n, i, 2), [0..n-1])); sum(k=1, #u, k*u[k])} CROSSREFS Cf. A000680, A334774, A334775, A334776. Sequence in context: A196959 A266485 A279132 * A081020 A017426 A244506 Adjacent sequences:  A334774 A334775 A334776 * A334778 A334779 A334780 KEYWORD nonn AUTHOR Andrew Howroyd, May 12 2020 STATUS approved

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Last modified May 27 16:48 EDT 2022. Contains 354110 sequences. (Running on oeis4.)