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A152515 1/7 of the number of permutations of 6 indistinguishable copies of 1..n with exactly 4 local maxima. 1
0, 50, 321315, 824734660, 1615456263653, 2896390530019554, 5041787615373941503, 8691245890710074064416, 14935422227548071392068185, 25640373750597951750787951486, 44004685572828990924291145512563, 75515015253707870321041620455156412, 129585276023496655588712207028376849165 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..200

PROG

(PARI) \\ PeaksBySig defined in A334774.

a(n) = {PeaksBySig(vector(n, i, 6), [3])[1]/7} \\ Andrew Howroyd, May 12 2020

CROSSREFS

Cf. A152513, A334774.

Sequence in context: A152514 A015062 A015038 * A111402 A174732 A087408

Adjacent sequences:  A152512 A152513 A152514 * A152516 A152517 A152518

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 06 2008

EXTENSIONS

Terms a(7) and beyond from Andrew Howroyd, May 12 2020

STATUS

approved

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Last modified September 22 19:36 EDT 2021. Contains 347608 sequences. (Running on oeis4.)